Linear cascade arrays of GaN-based green light-emitting diodes for high-speed and high-power performance

J. W. Shi, J. K. Sheu, C. K. Wang, C. C. Chen, C. H. Hsieh, J. I. Chyi, W. C. Lai

研究成果: 雜誌貢獻期刊論文同行評審

21 引文 斯高帕斯(Scopus)

摘要

In the following study, we demonstrated linear cascade GaN-based light-emitting-diode (LED) arrays at a wavelength of approximately 520 nm. Experimental LEDs were analyzed with the goal to improve the output power and differential efficiency of a single LED. The study shows that using arrays with up to four LEDs connected in series, we can achieve four times the improvement in output power (differential quantum efficiency) under the same bias current as compared to a single LED apparatus. We have also measured the modulation-speed performance of experimental LEDs, and both devices exhibit similar 3-dB bandwidth (90 MHz) under the same bias currents. Experimental results indicate that the cascade connection offers the advantages of significantly enhanced external differential efficiency and provision of a method to use a constant-voltage power supply. The current crowding problem and resistance-capacitance-limited bandwidth degradation issues in a large active area LED can also be minimized using the connection demonstrated in our experiment.

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頁(從 - 到)1368-1370
頁數3
期刊IEEE Photonics Technology Letters
19
發行號18
DOIs
出版狀態已出版 - 15 9月 2007

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