| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Frequency Response of Modulated Electroluminescence of Light-Emitting Diodes |
| FENG Lie-Feng1**, LI Yang1, LI Ding2, WANG Cun-Da1,2, ZHANG Guo-Yi2, YAO Dong-Sheng1, LIU Wei-Fang1, XING Peng-Fei1
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1Department of Applied Physics, Tianjin University, Tianjin 300072
2Research Center for Wide-band Gap Semiconductors, School of Physics, Peking University, Beijing 100871
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| Cite this article: |
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FENG Lie-Feng, LI Yang, LI Ding et al 2011 Chin. Phys. Lett. 28 107801 |
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Abstract Frequency responses of modulated electroluminescence (EL) of light-emitting diodes were measured using a testing setup. With increasing frequency of the ac signal, the relative light intensity (RLI) clearly decreases. Furthermore, a peculiar asynchrony between the RLI and ac small-signal is observed. At frequencies higher than 10 kHz, the RLI clearly lags behind the ac signal and the absolute value of the lagging angle is nearly proportional to the signal frequency. Using the classical recombination model of light-emitting diodes under ac small-signal modulation, these abnormal characteristics of modulated EL can be clearly explained.
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| Keywords:
78.60.Fi
85.30.De
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Received: 17 January 2011
Published: 28 September 2011
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| PACS: |
78.60.Fi
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(Electroluminescence)
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85.30.De
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(Semiconductor-device characterization, design, and modeling)
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