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Papers by Ramireddy Rajeswari
Solar Energy, 2018
We report the application of N,N′-Ethylene-bis(salicylideneiminato)-nickel (II) complex (Ni(salen... more We report the application of N,N′-Ethylene-bis(salicylideneiminato)-nickel (II) complex (Ni(salen)) and platinum (Pt) functionalized Ni(salen) complex as neoteric catalytic electrode (CE) for dye-sensitized solar cells (DSSC). Crystalline, one-dimensional (1D) hollow Ni(salen) complex was prepared via low-temperature chemical processes and used as a CE in DSSCs. 1D hollow Ni(salen) complex-based device exhibited low photo and dark-current density, due to the poor electron conduction and catalytic activity. Further improving the electrical and catalytic property of Ni(salen) complex, the complex functionalized with Pt on/in surface via sol-gel method at ambient condition; thereby enhance electron conduction and catalytic activity, increasing the photocurrent density (Jsc) from 9.05 to 14.40 mA·cm−2 and efficiency (η) 1.02 to 2.76%, respectively. The cyclic voltammetry data revealed that the Pt functionalized Ni(salen) complex electrode better electrocatalytic activity for I3−/I− redo...
Solar Energy
Abstract Trivalent erbium (Er3+) and erbium-yttribium (Er3+/Yb3+) co-doped Y2CaZnO5 (YCZ) nanopho... more Abstract Trivalent erbium (Er3+) and erbium-yttribium (Er3+/Yb3+) co-doped Y2CaZnO5 (YCZ) nanophosphors were synthesized via Sol-Gel combustion method and applied as photon up-converter in dye sensitized solar cell (DSSC) and studied for their photovoltaic properties. A bright green and green–red up-conversion emission is observed upon an excitation of 980 nm in Er3+:YCZ and Er3+/Yb3+:YCZ nanophosphors, respectively which indicates the possibility of using these phosphors for light harvesting applications. The prepared Er3+ and Er3+/Yb3+ co-doped YCZ nanophosphors were incorporated in TiO2 based DSSC to form the composite photoelectrode and studied the power conversion efficiency (PEC). With the incorporation of Er3+ and Er3+/Yb3+ co-doped YCZ nanophosphors in the DSSC resulted in the enhanced PCE of 6.01% and 7.21% using durable methoxypropionitrile (MPN) and volatile acetonitrile (AcN) based electrolytes, respectively. The PCE values obtained for the studied compounds are found to be either comparable or better than the other reported compounds used for the light harvesting. An enhanced photocurrent (JSC) of 12.44 and 13.28 mA/cm2, for Er3+:YCZ and Er3+/Yb3+:YCZ nanophosphors based DSSC, respectively was observed under AM1.5 G light due to the better photon conversion efficiency of the nanophosphor. The detailed up-conversion (UC) mechanism responsible for the enhanced PCE properties were discussed in detail and the results were compared with similar phosphor systems.
The Chemical Record, 2017
Hole transporting material (HTM) is a significant component to achieve the high performance perov... more Hole transporting material (HTM) is a significant component to achieve the high performance perovskite solar cells (PSCs). Over the years, inorganic, organic and hybrid (organic-inorganic) material based HTMs have been developed and investigated successfully. Today, perovskite solar cells achieved the efficiency of 22.1 % with with 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenyl-amine) 9,9-spirobifluorene (spiro-OMeTAD) as HTM. Nevertheless, synthesis and cost of organic HTMs is a major challenging issue and therefore alternative materials are required. From the past few years, inorganic HTMs showed large improvement in power conversion efficiency (PCE) and stability. Recently CuOx reached the PCE of 19.0% with better stability. These developments affirms that inorganic HTMs are better alternativesto the organic HTMs for next generation PSCs. In this report, we mainly focussed on the recent advances of inorganic and hybrid HTMs for PSCs and highlighted the efficiency and stability of PSCs improved by changing metal oxides as HTMs. Consequently, we expect that energy levels of these inorganic HTMs matches very well with the valence band of perovskites and improved efficiency helps in future practical deployment of low cost PSCs.
Hole transporting material (HTM) is a significant component to achieve the high performance perov... more Hole transporting material (HTM) is a significant component to achieve the high performance perovskite solar cells (PSCs). Over the years, inorganic, organic and hybrid (organic-inorganic) material based HTMs have been developed and investigated successfully. Today, perovskite solar cells achieved the efficiency of 22.1 % with with 2,2',7,7'-tetrakis(N,N-dip -methoxyphenyl-amine) 9,9-spirobifluorene (spiro-OMeTAD) as HTM. Nevertheless, synthesis and cost of organic HTMs is a major challenging issue and therefore alternative materials are required. From the past few years, inorganic HTMs showed large improvement in power conversion efficiency (PCE) and stability. Recently CuO x reached the PCE of 19.0% with better stability. These developments affirms that inorganic HTMs are better alternativesto the organic HTMs for next generation PSCs. In this report, we mainly focussed on the recent advances of inorganic and hybrid HTMs for PSCs and highlighted the efficiency and stability of PSCs improved by changing metal oxides as HTMs. Consequently, we expect that energy levels of these inorganic HTMs matches very well with the valence band of perovskites and improved efficiency helps in future practical deployment of low cost PSCs.
Yb 3 þ ions Near infra-red emission Radiation trapping High energy and high power lasers a b s t ... more Yb 3 þ ions Near infra-red emission Radiation trapping High energy and high power lasers a b s t r a c t This paper reports ytterbium-doped lead phosphate (PbPhYb) glasses made by meltquenching technique and their linear and nonlinear refractive indices. Raman and FTIR spectral analysis has been carried out to investigate the functional groups that constitute the host matrix. The oscillator strength of the absorption transition, ( 2 F 7/2 -2 F 5/2 ) has been evaluated by using the Smakula model for various concentrations. The near infra-red emission and excitation spectra have been investigated and observed that the profile of the emission spectra changes as a function of Yb 2 O 3 concentration, temperature, optical path length and thickness of the sample. From the optical absorption spectra, the spectroscopic and laser performance parameters have been evaluated and in turn used to estimate the gain cross-section of the Yb 3 þ ions. On the other hand, the lifetime for the 2 F 5/2 level of Yb 3 þ ion decreases with increase in Yb 2 O 3 concentration up to 6 mol% after an initial increase due to energy migration among the Yb 3 þ ions. The increase in lifetime could be due to radiation trapping but when the concentration is enlarged the energy migration processes are more predominant. The emission profile and lifetime change when the temperature is reduced to cryogenic temperature (11 K). The results reveal that the prepared glasses could be considered for high energy and high power laser as well as solid state cryocooler applications.
Nano Communications, 2014
Yb 3 þ ions Near infra-red emission Radiation trapping High energy and high power lasers a b s t ... more Yb 3 þ ions Near infra-red emission Radiation trapping High energy and high power lasers a b s t r a c t This paper reports ytterbium-doped lead phosphate (PbPhYb) glasses made by melt-quenching technique and their linear and nonlinear refractive indices. Raman and FTIR spectral analysis has been carried out to investigate the functional groups that constitute the host matrix. The oscillator strength of the absorption transition, (2 F 7/2-2 F 5/2) has been evaluated by using the Smakula model for various concentrations. The near infra-red emission and excitation spectra have been investigated and observed that the profile of the emission spectra changes as a function of Yb 2 O 3 concentration, temperature, optical path length and thickness of the sample. From the optical absorption spectra, the spectroscopic and laser performance parameters have been evaluated and in turn used to estimate the gain cross-section of the Yb 3 þ ions. On the other hand, the lifetime for the 2 F 5/2 level of Yb 3 þ ion decreases with increase in Yb 2 O 3 concentration up to 6 mol% after an initial increase due to energy migration among the Yb 3 þ ions. The increase in lifetime could be due to radiation trapping but when the concentration is enlarged the energy migration processes are more predominant. The emission profile and lifetime change when the temperature is reduced to cryogenic temperature (11 K). The results reveal that the prepared glasses could be considered for high energy and high power laser as well as solid state cryocooler applications.
There has been a stringent demand for blue ($450 to 470 nm) absorbing and red ($611 nm) emitting ... more There has been a stringent demand for blue ($450 to 470 nm) absorbing and red ($611 nm) emitting material systems in phosphor converted white light emitting diodes (WLEDs) available in the market. The conventionally used red-emitting Y 2 O 3 :Eu 3+ phosphor has negligible absorption for blue light produced by GaInN based LED chips. To address this issue, a new red-emitting Gd 2 CaZnO 5 :Eu 3+ (GCZO:Eu 3+) nanophosphor system having exceptionally strong absorption for blue ($465 nm) and significant red ($611 nm) photoluminescence is presented. This is attributed to a dominant f–f transition (5 D 0 / 7 F 2) of Eu 3+ ions, arising due to an efficient energy transfer from the Gd 3+ sites of the host lattice to Eu 3+ ions. The external quantum yield (QY) measured at 465 nm absorption and 611 nm emission revealed that the GCZO:Eu 3+ nanophosphor has better QY of 23% as compared to commercial Y 2 O 3 :Eu 3+ , which is <1%. X-ray diffraction and microscopy observations showed the nanocrystalline nature and slightly elongated morphology of the sample, respectively. While the energy dispersive X-ray analysis identified the chemical constituents of the GCZO:Eu 3+ nanophosphor, the color overlay imaging confirmed the substitution of Eu 3+ for Gd 3+ ions. As seen from the QY statistics it is highly anticipated that the multifold absorption at $465 nm would certainly improve the color rendering properties of existing WLEDs.
Novel near white light emitting Y 2 CaZnO 5 (YCZ) nanocrystalline powders doped with Dy 3 þ ions ... more Novel near white light emitting Y 2 CaZnO 5 (YCZ) nanocrystalline powders doped with Dy 3 þ ions were synthesized via the citrate gel combustion method. The structure of the compound is found to be triclinic with a particle size in the range of 20–30 nm. Luminescence properties have been characterized using photoluminescence (PL), excitation spectra and decay time measurements. The PL spectra have shown a broad blue band due to 4 F 9/2 → 6 H 15/2 transition and sharp yellow band corresponding to 4 F 9/2 → 6 H 13/2 transition of Dy 3 þ ions. From the concentration dependent PL studies, the optimum concentration of Dy 3 þ ions in YCZ is found to be 1.0 mol%, where intense near white light emission was observed. The Dy 3 þ :YCZ nanophosphor has shown relatively better white color properties than the reported Dy 3 þ :Y 2 O 3 nanophosphor. The yellow to blue intensity ratios, CIE chromaticity coordinates and correlated color temperature studies have shown the possibility of using this compound for white light emission.
Neodymium doped zinc-tellurite glasses of composition TeO 2 –ZnO–Na 2 O–Li 2 O have been prepared... more Neodymium doped zinc-tellurite glasses of composition TeO 2 –ZnO–Na 2 O–Li 2 O have been prepared and characterized for their thermal, structural and optical properties. Differential thermal analysis revealed reasonably good forming tendency of the glass composition. FTIR spectra were used to analyze the functional groups present in the glass. Judd–Ofelt intensity parameters were derived from the absorption spectrum and used to calculate the radiative lifetime, branching ratio and stimulated emission cross-section for 4 F 3/2 → 4 I 9/2, 11/2, 13/2 transitions. The quantum efficiency of the 4 F 3/2 level is comparable to the typical values obtained for the Nd 2 O 3-doped glasses. The decay properties for higher concentration of Nd 2 O 3 were analyzed using Inokuti–Hirayama model to investigate the non-radiative relaxation of the 4 F 3/2 emitting level. The experimental values of branching ratio and saturation intensity of 4 F 3/2 → 4 I 11/2 transition and calculated spectroscopic quality factor indicate the favourable lasing action in these glasses.
Thermal, structural and optical properties of Nd 3 + ions in tellurite glass (TeO 2 –ZnO–Na 2 O–L... more Thermal, structural and optical properties of Nd 3 + ions in tellurite glass (TeO 2 –ZnO–Na 2 O–Li 2 O–Nb 2 O 5) have been investigated. Differential thermal analysis revealed reasonably good forming tendency of the glass composition. FTIR spectra were used to analyze the functional groups present in the glass. Judd–Ofelt intensity parameters were derived from the absorption spectrum and used to calculate the radiative lifetime, branching ratio and stimulated emission cross-section of the 4 F 3/2-4 I 9/2 , 11/2, 13/2 transitions. The quantum efficiency of the 4 F 3/2 level is comparable as well as higher than the typical value of the other tellurite based glasses. The decay from the 4 F 3/2 level is found to be single exponential for different concentrations of Nd 3 + ions with a shortening of lifetime with increasing concentration. The experimental values of branching ratio and saturation intensity of 4 F 3/2-4 I 11/2 transition indicate the favourable lasing action with low threshold power.
Solar Energy, 2018
We report the application of N,N′-Ethylene-bis(salicylideneiminato)-nickel (II) complex (Ni(salen... more We report the application of N,N′-Ethylene-bis(salicylideneiminato)-nickel (II) complex (Ni(salen)) and platinum (Pt) functionalized Ni(salen) complex as neoteric catalytic electrode (CE) for dye-sensitized solar cells (DSSC). Crystalline, one-dimensional (1D) hollow Ni(salen) complex was prepared via low-temperature chemical processes and used as a CE in DSSCs. 1D hollow Ni(salen) complex-based device exhibited low photo and dark-current density, due to the poor electron conduction and catalytic activity. Further improving the electrical and catalytic property of Ni(salen) complex, the complex functionalized with Pt on/in surface via sol-gel method at ambient condition; thereby enhance electron conduction and catalytic activity, increasing the photocurrent density (Jsc) from 9.05 to 14.40 mA·cm−2 and efficiency (η) 1.02 to 2.76%, respectively. The cyclic voltammetry data revealed that the Pt functionalized Ni(salen) complex electrode better electrocatalytic activity for I3−/I− redo...
Solar Energy
Abstract Trivalent erbium (Er3+) and erbium-yttribium (Er3+/Yb3+) co-doped Y2CaZnO5 (YCZ) nanopho... more Abstract Trivalent erbium (Er3+) and erbium-yttribium (Er3+/Yb3+) co-doped Y2CaZnO5 (YCZ) nanophosphors were synthesized via Sol-Gel combustion method and applied as photon up-converter in dye sensitized solar cell (DSSC) and studied for their photovoltaic properties. A bright green and green–red up-conversion emission is observed upon an excitation of 980 nm in Er3+:YCZ and Er3+/Yb3+:YCZ nanophosphors, respectively which indicates the possibility of using these phosphors for light harvesting applications. The prepared Er3+ and Er3+/Yb3+ co-doped YCZ nanophosphors were incorporated in TiO2 based DSSC to form the composite photoelectrode and studied the power conversion efficiency (PEC). With the incorporation of Er3+ and Er3+/Yb3+ co-doped YCZ nanophosphors in the DSSC resulted in the enhanced PCE of 6.01% and 7.21% using durable methoxypropionitrile (MPN) and volatile acetonitrile (AcN) based electrolytes, respectively. The PCE values obtained for the studied compounds are found to be either comparable or better than the other reported compounds used for the light harvesting. An enhanced photocurrent (JSC) of 12.44 and 13.28 mA/cm2, for Er3+:YCZ and Er3+/Yb3+:YCZ nanophosphors based DSSC, respectively was observed under AM1.5 G light due to the better photon conversion efficiency of the nanophosphor. The detailed up-conversion (UC) mechanism responsible for the enhanced PCE properties were discussed in detail and the results were compared with similar phosphor systems.
The Chemical Record, 2017
Hole transporting material (HTM) is a significant component to achieve the high performance perov... more Hole transporting material (HTM) is a significant component to achieve the high performance perovskite solar cells (PSCs). Over the years, inorganic, organic and hybrid (organic-inorganic) material based HTMs have been developed and investigated successfully. Today, perovskite solar cells achieved the efficiency of 22.1 % with with 2,2&amp;amp;amp;amp;amp;#39;,7,7&amp;amp;amp;amp;amp;#39;-tetrakis(N,N-di-p-methoxyphenyl-amine) 9,9-spirobifluorene (spiro-OMeTAD) as HTM. Nevertheless, synthesis and cost of organic HTMs is a major challenging issue and therefore alternative materials are required. From the past few years, inorganic HTMs showed large improvement in power conversion efficiency (PCE) and stability. Recently CuOx reached the PCE of 19.0% with better stability. These developments affirms that inorganic HTMs are better alternativesto the organic HTMs for next generation PSCs. In this report, we mainly focussed on the recent advances of inorganic and hybrid HTMs for PSCs and highlighted the efficiency and stability of PSCs improved by changing metal oxides as HTMs. Consequently, we expect that energy levels of these inorganic HTMs matches very well with the valence band of perovskites and improved efficiency helps in future practical deployment of low cost PSCs.
Hole transporting material (HTM) is a significant component to achieve the high performance perov... more Hole transporting material (HTM) is a significant component to achieve the high performance perovskite solar cells (PSCs). Over the years, inorganic, organic and hybrid (organic-inorganic) material based HTMs have been developed and investigated successfully. Today, perovskite solar cells achieved the efficiency of 22.1 % with with 2,2',7,7'-tetrakis(N,N-dip -methoxyphenyl-amine) 9,9-spirobifluorene (spiro-OMeTAD) as HTM. Nevertheless, synthesis and cost of organic HTMs is a major challenging issue and therefore alternative materials are required. From the past few years, inorganic HTMs showed large improvement in power conversion efficiency (PCE) and stability. Recently CuO x reached the PCE of 19.0% with better stability. These developments affirms that inorganic HTMs are better alternativesto the organic HTMs for next generation PSCs. In this report, we mainly focussed on the recent advances of inorganic and hybrid HTMs for PSCs and highlighted the efficiency and stability of PSCs improved by changing metal oxides as HTMs. Consequently, we expect that energy levels of these inorganic HTMs matches very well with the valence band of perovskites and improved efficiency helps in future practical deployment of low cost PSCs.
Yb 3 þ ions Near infra-red emission Radiation trapping High energy and high power lasers a b s t ... more Yb 3 þ ions Near infra-red emission Radiation trapping High energy and high power lasers a b s t r a c t This paper reports ytterbium-doped lead phosphate (PbPhYb) glasses made by meltquenching technique and their linear and nonlinear refractive indices. Raman and FTIR spectral analysis has been carried out to investigate the functional groups that constitute the host matrix. The oscillator strength of the absorption transition, ( 2 F 7/2 -2 F 5/2 ) has been evaluated by using the Smakula model for various concentrations. The near infra-red emission and excitation spectra have been investigated and observed that the profile of the emission spectra changes as a function of Yb 2 O 3 concentration, temperature, optical path length and thickness of the sample. From the optical absorption spectra, the spectroscopic and laser performance parameters have been evaluated and in turn used to estimate the gain cross-section of the Yb 3 þ ions. On the other hand, the lifetime for the 2 F 5/2 level of Yb 3 þ ion decreases with increase in Yb 2 O 3 concentration up to 6 mol% after an initial increase due to energy migration among the Yb 3 þ ions. The increase in lifetime could be due to radiation trapping but when the concentration is enlarged the energy migration processes are more predominant. The emission profile and lifetime change when the temperature is reduced to cryogenic temperature (11 K). The results reveal that the prepared glasses could be considered for high energy and high power laser as well as solid state cryocooler applications.
Nano Communications, 2014
Yb 3 þ ions Near infra-red emission Radiation trapping High energy and high power lasers a b s t ... more Yb 3 þ ions Near infra-red emission Radiation trapping High energy and high power lasers a b s t r a c t This paper reports ytterbium-doped lead phosphate (PbPhYb) glasses made by melt-quenching technique and their linear and nonlinear refractive indices. Raman and FTIR spectral analysis has been carried out to investigate the functional groups that constitute the host matrix. The oscillator strength of the absorption transition, (2 F 7/2-2 F 5/2) has been evaluated by using the Smakula model for various concentrations. The near infra-red emission and excitation spectra have been investigated and observed that the profile of the emission spectra changes as a function of Yb 2 O 3 concentration, temperature, optical path length and thickness of the sample. From the optical absorption spectra, the spectroscopic and laser performance parameters have been evaluated and in turn used to estimate the gain cross-section of the Yb 3 þ ions. On the other hand, the lifetime for the 2 F 5/2 level of Yb 3 þ ion decreases with increase in Yb 2 O 3 concentration up to 6 mol% after an initial increase due to energy migration among the Yb 3 þ ions. The increase in lifetime could be due to radiation trapping but when the concentration is enlarged the energy migration processes are more predominant. The emission profile and lifetime change when the temperature is reduced to cryogenic temperature (11 K). The results reveal that the prepared glasses could be considered for high energy and high power laser as well as solid state cryocooler applications.
There has been a stringent demand for blue ($450 to 470 nm) absorbing and red ($611 nm) emitting ... more There has been a stringent demand for blue ($450 to 470 nm) absorbing and red ($611 nm) emitting material systems in phosphor converted white light emitting diodes (WLEDs) available in the market. The conventionally used red-emitting Y 2 O 3 :Eu 3+ phosphor has negligible absorption for blue light produced by GaInN based LED chips. To address this issue, a new red-emitting Gd 2 CaZnO 5 :Eu 3+ (GCZO:Eu 3+) nanophosphor system having exceptionally strong absorption for blue ($465 nm) and significant red ($611 nm) photoluminescence is presented. This is attributed to a dominant f–f transition (5 D 0 / 7 F 2) of Eu 3+ ions, arising due to an efficient energy transfer from the Gd 3+ sites of the host lattice to Eu 3+ ions. The external quantum yield (QY) measured at 465 nm absorption and 611 nm emission revealed that the GCZO:Eu 3+ nanophosphor has better QY of 23% as compared to commercial Y 2 O 3 :Eu 3+ , which is <1%. X-ray diffraction and microscopy observations showed the nanocrystalline nature and slightly elongated morphology of the sample, respectively. While the energy dispersive X-ray analysis identified the chemical constituents of the GCZO:Eu 3+ nanophosphor, the color overlay imaging confirmed the substitution of Eu 3+ for Gd 3+ ions. As seen from the QY statistics it is highly anticipated that the multifold absorption at $465 nm would certainly improve the color rendering properties of existing WLEDs.
Novel near white light emitting Y 2 CaZnO 5 (YCZ) nanocrystalline powders doped with Dy 3 þ ions ... more Novel near white light emitting Y 2 CaZnO 5 (YCZ) nanocrystalline powders doped with Dy 3 þ ions were synthesized via the citrate gel combustion method. The structure of the compound is found to be triclinic with a particle size in the range of 20–30 nm. Luminescence properties have been characterized using photoluminescence (PL), excitation spectra and decay time measurements. The PL spectra have shown a broad blue band due to 4 F 9/2 → 6 H 15/2 transition and sharp yellow band corresponding to 4 F 9/2 → 6 H 13/2 transition of Dy 3 þ ions. From the concentration dependent PL studies, the optimum concentration of Dy 3 þ ions in YCZ is found to be 1.0 mol%, where intense near white light emission was observed. The Dy 3 þ :YCZ nanophosphor has shown relatively better white color properties than the reported Dy 3 þ :Y 2 O 3 nanophosphor. The yellow to blue intensity ratios, CIE chromaticity coordinates and correlated color temperature studies have shown the possibility of using this compound for white light emission.
Neodymium doped zinc-tellurite glasses of composition TeO 2 –ZnO–Na 2 O–Li 2 O have been prepared... more Neodymium doped zinc-tellurite glasses of composition TeO 2 –ZnO–Na 2 O–Li 2 O have been prepared and characterized for their thermal, structural and optical properties. Differential thermal analysis revealed reasonably good forming tendency of the glass composition. FTIR spectra were used to analyze the functional groups present in the glass. Judd–Ofelt intensity parameters were derived from the absorption spectrum and used to calculate the radiative lifetime, branching ratio and stimulated emission cross-section for 4 F 3/2 → 4 I 9/2, 11/2, 13/2 transitions. The quantum efficiency of the 4 F 3/2 level is comparable to the typical values obtained for the Nd 2 O 3-doped glasses. The decay properties for higher concentration of Nd 2 O 3 were analyzed using Inokuti–Hirayama model to investigate the non-radiative relaxation of the 4 F 3/2 emitting level. The experimental values of branching ratio and saturation intensity of 4 F 3/2 → 4 I 11/2 transition and calculated spectroscopic quality factor indicate the favourable lasing action in these glasses.
Thermal, structural and optical properties of Nd 3 + ions in tellurite glass (TeO 2 –ZnO–Na 2 O–L... more Thermal, structural and optical properties of Nd 3 + ions in tellurite glass (TeO 2 –ZnO–Na 2 O–Li 2 O–Nb 2 O 5) have been investigated. Differential thermal analysis revealed reasonably good forming tendency of the glass composition. FTIR spectra were used to analyze the functional groups present in the glass. Judd–Ofelt intensity parameters were derived from the absorption spectrum and used to calculate the radiative lifetime, branching ratio and stimulated emission cross-section of the 4 F 3/2-4 I 9/2 , 11/2, 13/2 transitions. The quantum efficiency of the 4 F 3/2 level is comparable as well as higher than the typical value of the other tellurite based glasses. The decay from the 4 F 3/2 level is found to be single exponential for different concentrations of Nd 3 + ions with a shortening of lifetime with increasing concentration. The experimental values of branching ratio and saturation intensity of 4 F 3/2-4 I 11/2 transition indicate the favourable lasing action with low threshold power.