Rita Rana - Academia.edu (original) (raw)
Papers by Rita Rana
Journal of Electronic Materials, Apr 23, 2019
This paper proposes a flexible transparent organic light-emitting diode (OLED) which is notable d... more This paper proposes a flexible transparent organic light-emitting diode (OLED) which is notable due to its high electron injection and transmittance. Though graphene-based OLEDs are promising candidates for flexible displays due to the enormous merits offered, a significant decrease in its device efficiency was reported in comparison to the other conventional indium tin oxidebased OLEDs. The device illustrated enhances the performance of the graphene-based flexible OLEDs through balanced charge recombination. A theoretical analysis has been done through performing optical simulations. The structure of the graphene-based OLED is optimized through the employment of efficient cathode and electron injection layer materials to boost the electron injection into the device. With the aid of simulations, it was found that optimum results are obtained with aluminum zinc oxide (Al:ZnO) as the cathode and Al/LiF/Alq 3 as the electron injection layer. The proposed structure exhibits high transmittance of 87.14% with a current efficiency of 61.17 cd/A, and external quantum efficiency (EQE) of 21.2% at 1000 cd/m 2 for the bottom side. An evident improvement in the device performance with 32.9% increase in the current efficiency, and 45.2% increase in the EQE was observed.
Lecture notes in electrical engineering, 2019
OLEDs have turned out to be the boon in the field of display technology and solid-state lighting ... more OLEDs have turned out to be the boon in the field of display technology and solid-state lighting because of compelling characteristics. They have remarkably emerged as an energy-saving technology to cope up with the increased demand for electricity and its generation. OLEDs are solid-state devices which consume very less power and have very low driving voltage. LEDs have grabbed so much of attention because of minuscule energy consumption, but this even newer technology is intriguing the interest of both manufacturers and consumers. OLED displays offer startling vivid pictures of high-definition resolution with vibrant and radiant colors and highly efficient illumination. Companies are investing significant financial resources for the development of future technology. So, there is a need of the hour to study in depth the milestones and challenges of this emerging technology. The critical areas on which the enormous valuable improvements are being carried out involve efficient current injection, light extraction techniques, efficiency, lifetime issues, and power consumption. The central idea of the review is to make the reader familiar with the structural and the operational details of the device, types of OLED and their drawbacks, material science, and important parameters governing the huge success of the OLED technology.
2022 IEEE International Conference on Emerging Electronics (ICEE)
This paper presents ASIC design of digital down converter using 90nm technology for software defi... more This paper presents ASIC design of digital down converter using 90nm technology for software defined applications. Computationally efficient multistage design technique is used to provide optimized solution for Third Generation Mobile Communications. Parks McClellan algorithm is used to minimize the filter order along with efficient polyphase decomposition technique. Multiplier based partially serial algorithm is used to enhance the performance in terms of area and power consumption. Multipliers and adders are optimally placed and routed to reduce the silicon area. The proposed Digital Down Converter ASIC has consumed 601 mm 2 area by consuming 3169.607 nW power to provide high performance optimized solution to software defined radios.
The paper is dedicated to the design of multiband digital FIR filter for removal of various inter... more The paper is dedicated to the design of multiband digital FIR filter for removal of various interference signals present in the ECG signal which does not allow the correct diagnosis of the patient. Filtering is finding its applications in wide domains and one of those domains is the biomedical science. ECG is the electrical response of the heart with respect to time. Heart diseases especially heart attacks are way common today and to detect this very precise detailing is required. There is no scope for allowed interference level or noise which corrupts the signal. Seven band filter is designed which will remove the frequencies that are prone to disturbances i.e. the various spectral components where particular type of noise from different sources dominates like noise from power line, respiration, muscle movement etc. The filter is developed and designed in Matlab along with Xilinx DSP tools synthesized with XST using Spartan 6 and Virtex 5 as target device. Filter is optimized using...
A study has been conducted on green microcavity flexible organic light emitting diodes to exploit... more A study has been conducted on green microcavity flexible organic light emitting diodes to exploit its merits in enhancing the outcoupling efficiency of the device. Graphene based OLEDs have shown reported decrease in the device efficiencies in comparison to the conventional Indium Tin Oxide counterparts. The different device structures with quarter-wave stack alternating layers of high index titanium dioxide, TiO2 and low index silicon dioxide, SiO2 were simulated to study the effects of cavity length tuning for the optimum constructive interference resulting in the maximum outcoupling of the light. However, these DBR structures do not meet the mechanical flexibility compliance for the flexible OLEDs. Therefore, a device is proposed that exploits the theory of internal refraction and reflection that takes place between the high refractive index, TiO2 layer and the low refractive index hole injection layers sandwiching the graphene anode to maximize microcavity enhancement in the dev...
Lecture Notes in Electrical Engineering, 2019
OLEDs have turned out to be the boon in the field of display technology and solid-state lighting ... more OLEDs have turned out to be the boon in the field of display technology and solid-state lighting because of compelling characteristics. They have remarkably emerged as an energy-saving technology to cope up with the increased demand for electricity and its generation. OLEDs are solid-state devices which consume very less power and have very low driving voltage. LEDs have grabbed so much of attention because of minuscule energy consumption, but this even newer technology is intriguing the interest of both manufacturers and consumers. OLED displays offer startling vivid pictures of high-definition resolution with vibrant and radiant colors and highly efficient illumination. Companies are investing significant financial resources for the development of future technology. So, there is a need of the hour to study in depth the milestones and challenges of this emerging technology. The critical areas on which the enormous valuable improvements are being carried out involve efficient current injection, light extraction techniques, efficiency, lifetime issues, and power consumption. The central idea of the review is to make the reader familiar with the structural and the operational details of the device, types of OLED and their drawbacks, material science, and important parameters governing the huge success of the OLED technology.
Journal of Electronic Materials, 2019
This paper proposes a flexible transparent organic light-emitting diode (OLED) which is notable d... more This paper proposes a flexible transparent organic light-emitting diode (OLED) which is notable due to its high electron injection and transmittance. Though graphene-based OLEDs are promising candidates for flexible displays due to the enormous merits offered, a significant decrease in its device efficiency was reported in comparison to the other conventional indium tin oxidebased OLEDs. The device illustrated enhances the performance of the graphene-based flexible OLEDs through balanced charge recombination. A theoretical analysis has been done through performing optical simulations. The structure of the graphene-based OLED is optimized through the employment of efficient cathode and electron injection layer materials to boost the electron injection into the device. With the aid of simulations, it was found that optimum results are obtained with aluminum zinc oxide (Al:ZnO) as the cathode and Al/LiF/Alq 3 as the electron injection layer. The proposed structure exhibits high transmittance of 87.14% with a current efficiency of 61.17 cd/A, and external quantum efficiency (EQE) of 21.2% at 1000 cd/m 2 for the bottom side. An evident improvement in the device performance with 32.9% increase in the current efficiency, and 45.2% increase in the EQE was observed.
2022 IEEE International Conference on Emerging Electronics (ICEE)
Journal of Electronic Materials, Apr 23, 2019
This paper proposes a flexible transparent organic light-emitting diode (OLED) which is notable d... more This paper proposes a flexible transparent organic light-emitting diode (OLED) which is notable due to its high electron injection and transmittance. Though graphene-based OLEDs are promising candidates for flexible displays due to the enormous merits offered, a significant decrease in its device efficiency was reported in comparison to the other conventional indium tin oxidebased OLEDs. The device illustrated enhances the performance of the graphene-based flexible OLEDs through balanced charge recombination. A theoretical analysis has been done through performing optical simulations. The structure of the graphene-based OLED is optimized through the employment of efficient cathode and electron injection layer materials to boost the electron injection into the device. With the aid of simulations, it was found that optimum results are obtained with aluminum zinc oxide (Al:ZnO) as the cathode and Al/LiF/Alq 3 as the electron injection layer. The proposed structure exhibits high transmittance of 87.14% with a current efficiency of 61.17 cd/A, and external quantum efficiency (EQE) of 21.2% at 1000 cd/m 2 for the bottom side. An evident improvement in the device performance with 32.9% increase in the current efficiency, and 45.2% increase in the EQE was observed.
Lecture notes in electrical engineering, 2019
OLEDs have turned out to be the boon in the field of display technology and solid-state lighting ... more OLEDs have turned out to be the boon in the field of display technology and solid-state lighting because of compelling characteristics. They have remarkably emerged as an energy-saving technology to cope up with the increased demand for electricity and its generation. OLEDs are solid-state devices which consume very less power and have very low driving voltage. LEDs have grabbed so much of attention because of minuscule energy consumption, but this even newer technology is intriguing the interest of both manufacturers and consumers. OLED displays offer startling vivid pictures of high-definition resolution with vibrant and radiant colors and highly efficient illumination. Companies are investing significant financial resources for the development of future technology. So, there is a need of the hour to study in depth the milestones and challenges of this emerging technology. The critical areas on which the enormous valuable improvements are being carried out involve efficient current injection, light extraction techniques, efficiency, lifetime issues, and power consumption. The central idea of the review is to make the reader familiar with the structural and the operational details of the device, types of OLED and their drawbacks, material science, and important parameters governing the huge success of the OLED technology.
2022 IEEE International Conference on Emerging Electronics (ICEE)
This paper presents ASIC design of digital down converter using 90nm technology for software defi... more This paper presents ASIC design of digital down converter using 90nm technology for software defined applications. Computationally efficient multistage design technique is used to provide optimized solution for Third Generation Mobile Communications. Parks McClellan algorithm is used to minimize the filter order along with efficient polyphase decomposition technique. Multiplier based partially serial algorithm is used to enhance the performance in terms of area and power consumption. Multipliers and adders are optimally placed and routed to reduce the silicon area. The proposed Digital Down Converter ASIC has consumed 601 mm 2 area by consuming 3169.607 nW power to provide high performance optimized solution to software defined radios.
The paper is dedicated to the design of multiband digital FIR filter for removal of various inter... more The paper is dedicated to the design of multiband digital FIR filter for removal of various interference signals present in the ECG signal which does not allow the correct diagnosis of the patient. Filtering is finding its applications in wide domains and one of those domains is the biomedical science. ECG is the electrical response of the heart with respect to time. Heart diseases especially heart attacks are way common today and to detect this very precise detailing is required. There is no scope for allowed interference level or noise which corrupts the signal. Seven band filter is designed which will remove the frequencies that are prone to disturbances i.e. the various spectral components where particular type of noise from different sources dominates like noise from power line, respiration, muscle movement etc. The filter is developed and designed in Matlab along with Xilinx DSP tools synthesized with XST using Spartan 6 and Virtex 5 as target device. Filter is optimized using...
A study has been conducted on green microcavity flexible organic light emitting diodes to exploit... more A study has been conducted on green microcavity flexible organic light emitting diodes to exploit its merits in enhancing the outcoupling efficiency of the device. Graphene based OLEDs have shown reported decrease in the device efficiencies in comparison to the conventional Indium Tin Oxide counterparts. The different device structures with quarter-wave stack alternating layers of high index titanium dioxide, TiO2 and low index silicon dioxide, SiO2 were simulated to study the effects of cavity length tuning for the optimum constructive interference resulting in the maximum outcoupling of the light. However, these DBR structures do not meet the mechanical flexibility compliance for the flexible OLEDs. Therefore, a device is proposed that exploits the theory of internal refraction and reflection that takes place between the high refractive index, TiO2 layer and the low refractive index hole injection layers sandwiching the graphene anode to maximize microcavity enhancement in the dev...
Lecture Notes in Electrical Engineering, 2019
OLEDs have turned out to be the boon in the field of display technology and solid-state lighting ... more OLEDs have turned out to be the boon in the field of display technology and solid-state lighting because of compelling characteristics. They have remarkably emerged as an energy-saving technology to cope up with the increased demand for electricity and its generation. OLEDs are solid-state devices which consume very less power and have very low driving voltage. LEDs have grabbed so much of attention because of minuscule energy consumption, but this even newer technology is intriguing the interest of both manufacturers and consumers. OLED displays offer startling vivid pictures of high-definition resolution with vibrant and radiant colors and highly efficient illumination. Companies are investing significant financial resources for the development of future technology. So, there is a need of the hour to study in depth the milestones and challenges of this emerging technology. The critical areas on which the enormous valuable improvements are being carried out involve efficient current injection, light extraction techniques, efficiency, lifetime issues, and power consumption. The central idea of the review is to make the reader familiar with the structural and the operational details of the device, types of OLED and their drawbacks, material science, and important parameters governing the huge success of the OLED technology.
Journal of Electronic Materials, 2019
This paper proposes a flexible transparent organic light-emitting diode (OLED) which is notable d... more This paper proposes a flexible transparent organic light-emitting diode (OLED) which is notable due to its high electron injection and transmittance. Though graphene-based OLEDs are promising candidates for flexible displays due to the enormous merits offered, a significant decrease in its device efficiency was reported in comparison to the other conventional indium tin oxidebased OLEDs. The device illustrated enhances the performance of the graphene-based flexible OLEDs through balanced charge recombination. A theoretical analysis has been done through performing optical simulations. The structure of the graphene-based OLED is optimized through the employment of efficient cathode and electron injection layer materials to boost the electron injection into the device. With the aid of simulations, it was found that optimum results are obtained with aluminum zinc oxide (Al:ZnO) as the cathode and Al/LiF/Alq 3 as the electron injection layer. The proposed structure exhibits high transmittance of 87.14% with a current efficiency of 61.17 cd/A, and external quantum efficiency (EQE) of 21.2% at 1000 cd/m 2 for the bottom side. An evident improvement in the device performance with 32.9% increase in the current efficiency, and 45.2% increase in the EQE was observed.
2022 IEEE International Conference on Emerging Electronics (ICEE)