Emission spectral studies of phthalocyanines in borate glass matrix (original) (raw)

02-B C. Jamalaiah et al. Journal of Luminescence 129 (2009) 363–369

Room temperature visible and near infrared optical absorption and emission spectra of Sm 3+ -doped lead borate titanate aluminum fluoride (LBTAF) glasses with molar composition (50Àx) PbOÀ30H 3-BO 3 À10TiO 2 À10AlF 3 ÀxSm 2 O 3 (x ¼ 0.1, 0.5, 1.0 and 2.0) have been analyzed. Energy parameters for the 4f 5 electronic configuration of Sm 3+ : LBTAF glasses have been evaluated using free-ion Hamiltonian model. The experimental oscillator strengths of absorption bands have been used to determine the J-O parameters. Fluorescence spectra were recorded by exciting the samples with 402 nm. Using the J-O parameters and luminescence data, the radiative transition probabilities (A R ), branching ratios (b R ) and stimulated emission cross-sections (s e ) were obtained. The decay curves of 4 G 5/2 -6 H 7/2 transition exhibit single exponential for lower concentration (0.1 mol%) and non-exponential for higher concentrations. This concentration quenching has been attributed to the energy transfer through cross-relaxation between Sm 3+ ions. From the values of the radiative parameters, it is concluded that 1.0 mol% Sm 3+ -doped LBTAF glass may be used for laser active medium with emission wavelength at 600 nm.

Fluorescence of Acridine Orange in inorganic glass matrices

Applied Physics B Laser and Optics, 1994

Steady-state, time-resolved and polarizationresolved fluorescence studies of glasses doped with acridine orange with concentrations near 10 -3 M/L are reported. It was found that at this concentration a noticeable part of dye molecules exists in the form of dimers. By means of a polarization-resolved spectroscopic technique the structure of dimers was found to be consistent with the simple exciton theory.

Compositional dependence of white light emission in Dy3+ doped NaCl−BaO bismuth borate glasses

Journal of Luminescence, 2019

The present study deals with synthesis, characterization and analysis of dysprosium doped NaClBaOBi 2 O 3 B 2 O 3 glass samples so as to evaluate its feasibility in solid state lighting applications. Various analytical investigations viz. X-ray diffraction (XRD), density, molar volume measurement, Fourier Transfer Infrared (FTIR) Spectroscopy, UV-Vis-NIR and photoluminescence (PL) has been carried out to study the impact of replacing BaO by NaCl content on white light emission parameters in the host glass matrix. The glassy nature of the prepared samples was confirmed through peak free X-ray diffraction profiles. FTIR spectroscopy reveals the network modifier role of NaCl as four coordinated boron are converted into three coordinated ones. Six absorption peaks from 6 H 15/2 ground state to 4 I 15/2 , 6 F 5/2 , 6 F 7/2 , 6 F 9/2 , 6 H 9/2 , 6 H 11/2 excited states were observed from UV-Vis-NIR spectra of all glass samples. The fundamental absorption edge, optical band gap and Urbach energy were calculated and reported in the present study. Excitation spectra recorded at 578 nm provide six excitation peaks at 349, 363, 386, 425, 452, 471 nm. The highly intense peak at 452 nm was further selected to record the emission spectra and four prominent peaks centred at 484 nm (blue), 578 nm (yellow), 668 nm (red) and 755 nm due to various 4 F 9/2  6 H J (J= 9/2, 11/2, 13/2, 15/2) radiative transitions in visible and near infrared region of the spectra were observed. From emission spectra various parameters viz. Y/B ratio, (x,y) chromaticity coordinates, and correlated color temperature (CCT) were determined. The Y/B ratio for all the glass samples was found to be greater than 1 signifying a covalent bonding between Dy 3+ and O 2ions. The obtained (x,y) coordinates shows a balanced white emission (0.36, 0.39) which is quite stable with varying compositions. The value of CCT for present glass system was found to lie between 43394537 K which is a characteristic of near the white light region marking the suitability of synthesized glasses as an alternative materials for solid state lightening applications.

Optical properties of porphyrins in borate glassy matrix

Materials Chemistry and Physics, 2002

Optical properties of free and substituted porphyrins (PP) doped borate glass matrix are reported for the first time. Absorption spectral !l5urernents of H2 TPP, CdTPP, MgTPP and ZnTPP doped borate glass matrix have been made in the 200-1100 nm region and the :l:traobtained are analyzed to obtain the optical bandgap (Eg) and other important spectral parameters viz. oscillator strength (f), molar :Iinction coefficient (e), electric dipole strength (l), absorption cross-section (a.) and molecular concentration (N). Intense fluorescence ~observed in the region 668-685 nm for CdTPP, ZnTPP and MgTPP doped matrices, whereas no such fluorescence was observed in ~TPP doped matrix. Fluorescence intensity was observed to be almost similar in all the metallated porphyrine matrices. Fluorescence mdwidth (~)..), decay time (r), stimulated emission cross-section (a) and optical gain (G) of the principal fluorescence transitions iUesponding to the Q-band excitation were also evaluated and discussed.

Spectral studies of praseodymium doped heavy metal borate glass systems

Praseodymium doped HMO glasses are fabricated with the following compositions using conventional melt quenching technique. The compositions of the glass systems are 12 ZnO + 33 B2O3 + (50-x) PbO + (x+10) CaO + 4 Al2O3 + 1 Pr6O11 where (x = 0,10,20,30 and 40 mol %.). Certain physical properties of these systems have been evaluated and reported. Spectral data for all these systems were recorded for X-ray diffraction, Optical absorption and Fluorescence properties. The Judd-Ofelt intensity parameters Ωλ ( λ = 2,4,6) were evaluated from the spectral data and in turn employed to evaluate the lasing parameters of Pr3+ HMO glass systems such as radiative transition probabilities (A), radiative life-times (τR), branching ratios (βR) absorption cross-sections (σa) and Stimulated emission cross-sections (σe). The experimental and calculated branching ratios (βR) for the lasing transitions 3P0 3H4, 3P0 3H6, and 3P0 3F2 are found to be in good agreement in the present work.

10 J Suresh Kumar et al Journal of Luminescence 130 2010 1916 1923

Calcium fluoroborate (CFB) glasses doped with different concentrations of trivalent dysprosium ions were prepared and investigated by the FTIR, optical absorption, photoluminescence and decay analysis. Free-ion Hamiltonian model and Judd-Ofelt theory have been used to analyze the energy level scheme and the spectral intensities of Dy 3 + ions in CFB glasses. From the emission spectra it is observed that the samples emit intense light yellowish color which is nearer to white light. Chromaticity color coordinates have been calculated and the dominant emission wavelength has also been indicated. Decay curves of 4 F 9/2 level for the samples with different concentrations have been analyzed using the Inokuti-Hirayama model and the energy transfer and non-radiative decay rates have been determined.

Quenching of the luminescence of organic compounds by oxygen in glassy matrices

Chemical Physics, 1990

Stationary and pulsed luminescence spectroscopy has been used to study the effect of dissolved oxygen (up to 1 mol/P) on quantum yields and decay kinetics of fluorescence and phosphorescence of a number of organic compounds in alcohol glasses at 77 K. A comparison of stationary and kinetic data on the fluorescence quenching has shown oxygen to form complexes with organic molecules in the ground state. Stability constants for the complexes of pyrene, phenanthrene, and carbazole with oxygen (1 .O-2.6 P/mol) have been estimated. Analysis of the kinetic curves of luminescence decay in the presence of oxygen has been made with the assumption of a long-range exchange quenching mechanism. Characteristic decay parameters of the exchange interaction (L) between excited molecules of the studied compounds and oxygen have been determined to be 0.6-0.7 A for phosphorescence quenching, 0.9-l .O A for pyrene and phenanthrene fluorescence quenching, I .9 f 0.3 8, for carbazole fluorescence quenching. Quantitative information has been interpreted theoretically.

Physical and optical properties of phthalocyanine doped inorganic glasses

Journal of Materials …, 2000

Physical and optical properties of various free base and metallic phthalocyanine (Pc) doped glass matrix are reported for the first time. Absorption spectral measurements of H2Pc, MnPc, NiPc, CoPc, CuPc, MoOPc, ZnPc and FePc doped borate glass matrix have been ...

07-B C. Jamalaiah et al. Journal of Luminescence 129 (2009) 1023–1028

Spectroscopic and laser properties of PbO-H 3 BO 3 -TiO 2 -AlF 3 glasses doped with 0.1, 0.5, 1.0 and 2.0 mol% of Pr 6 O 11 have been studied. Optical absorption spectra were recorded in the UV-vis-NIR regions and the observed absorption bands were assigned to different electronic transitions from 3 H 4 ground state of 4f 2 configuration. The three phenomenological Judd-Ofelt (J-O) parameters O t (t ¼ 2, 4, 6) were determined from the measured oscillator strengths by including as well as excluding the 3 H 4 -3 P 2 hypersensitive transition in J-O analysis. The emission characteristics such as stimulated emission cross-sections (s e ), measured branching ratios (b m ), measured lifetimes (t m ), quantum efficiencies (Z) and gain parameters (s e  t m ) have been evaluated for the principal intermanifold transitions of Pr 3+ from the 3 P 0 and 1 D 2 states to the lower lying manifolds in the visible region. From the emission and decay measurements, the effect of Pr 3+ ion concentration on the quenching of the 1 D 2 measured lifetimes has been discussed.

Optical absorption and emission spectral studies of phthalocyanine molecules in DMF

Journal of Porphyrins and Phthalocyanines (JPP), 2001

Optical absorption and emission spectral studies of various phthalocyanine (Pc) molecules in dimethyl formamide (DMF) solvent are reported in this paper. Measurements have been done for free base, Eu, Fe, Mn, Sm, Cu, Zn, Nd and La Pc-s. The principal optical transitions viz B and Q are identified and some of the important spectral parameters such as molar extinction coefficient (e), absorption cross section ( a ), dipole strength (q) and oscillator strength (f) are evaluated for the prominent Q-band. The measured radiative parameters viz emission cross section ( e ), fluorescence bandwidth (D) and optical gain (G) show wide variation among different systems. The results obtained are compared with other solid matrices such as glass and polymer.