11 February 2010 High efficiency green LEDs using II-VI color converters
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Abstract
II-VI semiconductors can exhibit strong photoluminescence throughout the visible spectrum and are excellent candidates for filling the so-called "green gap". We report on the performance of green color-converted LEDs fabricated by bonding CdMgZnSe multiple quantum well structures to high-efficiency blue-emitting GaInN LEDs. A device efficacy of 181 lm/W at 537 nm (dominant) is measured under room temperature, 350 mA/mm2 quasi-cw conditions, more than twice as efficient as typical commercial green LEDs today. The thermal roll-off is shown to be comparable to that of typical green GaInN LEDs. Finally, the implications of the availability of high-efficiency, narrow-band, green and yellow emitters in display applications will be discussed.
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Thomas J. Miller, Thomas J. Miller, Michael A. Haase, Michael A. Haase, Xiaoguang Sun, Xiaoguang Sun, Bing Hao, Bing Hao, Junying Zhang, Junying Zhang, Terry L. Smith, Terry L. Smith, Todd Ballen, Todd Ballen, Junqing Xie, Junqing Xie, Amy S. Barnes, Amy S. Barnes, Fedja Kecman, Fedja Kecman, Joseph Yang, Joseph Yang, James Thielen, James Thielen, Catherine A. Leatherdale, Catherine A. Leatherdale, Ralph Wirth, Ralph Wirth, Andreas Biebersdorf, Andreas Biebersdorf, Karl Engl, Karl Engl, Stefan Groetsch, Stefan Groetsch, } "High efficiency green LEDs using II-VI color converters", Proc. SPIE 7617, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XIV, 76171A (11 February 2010); doi: 10.1117/12.853330; https://doi.org/10.1117/12.853330
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