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

J. W. Shi, Jinn-Kong Sheu, C. K. Wang, C. C. Chen, C. H. Hsieh, J. I. Chyi, Wei-Chi Lai

研究成果: Article

19 引文 (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.

原文English
頁(從 - 到)1368-1370
頁數3
期刊IEEE Photonics Technology Letters
19
發行號18
DOIs
出版狀態Published - 2007 九月 15

指紋

Light emitting diodes
cascades
light emitting diodes
high speed
Bias currents
Cascade connections
bandwidth
Bandwidth
crowding
output
power efficiency
Quantum efficiency
power supplies
quantum efficiency
Capacitance
capacitance
Modulation
degradation
modulation
Degradation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

引用此文

Shi, J. W. ; Sheu, Jinn-Kong ; Wang, C. K. ; Chen, C. C. ; Hsieh, C. H. ; Chyi, J. I. ; Lai, Wei-Chi. / Linear cascade arrays of GaN-based green light-emitting diodes for high-speed and high-power performance. 於: IEEE Photonics Technology Letters. 2007 ; 卷 19, 編號 18. 頁 1368-1370.
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abstract = "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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Linear cascade arrays of GaN-based green light-emitting diodes for high-speed and high-power performance. / Shi, J. W.; Sheu, Jinn-Kong; Wang, C. K.; Chen, C. C.; Hsieh, C. H.; Chyi, J. I.; Lai, Wei-Chi.

於: IEEE Photonics Technology Letters, 卷 19, 編號 18, 15.09.2007, p. 1368-1370.

研究成果: Article

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AU - Shi, J. W.

AU - Sheu, Jinn-Kong

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AU - Hsieh, C. H.

AU - Chyi, J. I.

AU - Lai, Wei-Chi

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