Efficiency of True-Green Light Emitting Diodes: Non-Uniformity and Temperature Effects
| Autor: | Amit Yadav, Sergey Yu. Karpov, Denis V. Mamedov, Edik U. Rafailov, V. L. Zerova, I. E. Titkov |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
light extraction efficiency
02 engineering and technology Green-light condensed_matter_physics extended defects 7. Clean energy 01 natural sciences lcsh:Technology Article law.invention law 0103 physical sciences General Materials Science Emission spectrum lcsh:Microscopy Quantum InGaN green LEDs Diode lcsh:QC120-168.85 010302 applied physics Physics Range (particle radiation) lcsh:QH201-278.5 nanotechnology business.industry lcsh:T active region non-uniformity temperature-dependent electroluminescence internal quantum efficiency modeling Atmospheric temperature range 021001 nanoscience & nanotechnology lcsh:TA1-2040 Optoelectronics Quantum efficiency lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering 0210 nano-technology business lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 Light-emitting diode |
| Zdroj: | Materials; Volume 10; Issue 11; Pages: 1323 Materials, Vol 10, Iss 11, p 1323 (2017) Materials |
| Popis: | External quantum efficiency of industrial-grade green InGaN light-emitting diodes (LEDs) has been measured in a wide range of operating currents at various temperatures from 13 K to 300 K. Unlike blue LEDs, the efficiency as a function of current is found to have a multi-peak character, which could not be fitted by a simple ABC-model. This observation correlated with splitting of LED emission spectra into two peaks at certain currents. The characterization data are interpreted in terms of non-uniformity of the LED active region, which is tentatively attributed to extended defects like V-pits. We suggest a new approach to evaluation of temperature-dependent light extraction and internal quantum efficiencies taking into account the active region non-uniformity. As a result, the temperature dependence of light extraction and internal quantum efficiencies have been evaluated in the temperature range mentioned above and compared with those of blue LEDs. |
| Databáze: | OpenAIRE |
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