Resonant-cavity based monolithic white light-emitting diode

Lirong Huang; Dexiu Huang; Feng Wen

doi:10.1117/12.741391

19 November 2007 Resonant-cavity based monolithic white light-emitting diode

Lirong Huang, Dexiu Huang, Feng Wen

Author Affiliations +

Proceedings Volume 6782, Optoelectronic Materials and Devices II; 678222 (2007) https://doi.org/10.1117/12.741391
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China

Abstract

We propose a new scheme of resonant-cavity (RC) based monolithic white LED, it relaxes the hard requirement of high internal quantum efficiency of yellow multi-quantum (MQW) and offers an easy way to obtain high luminous efficacy white light emission. In the proposed white LED, the blue MQW and yellow MQW active layer are embedded in a resonant-cavity defined by the bottom distributed Bragg reflector(DBR) and top DBR. For a optimal design of RC-based white LED, the extraction efficiency for yellow light is enhanced, while that for blue light is suppressed, thus intensity ratio of yellow light in the emitting light is increased, which not only helps to obtain white emission in spite of the low internal quantum efficiency of yellow light, but also doubles luminous efficacy. The color coordinates and luminous flux of the emitting light from RC-based white LED are calculated and the performance dependence on directionality is investigated.

Citation Download Citation

Lirong Huang, Dexiu Huang, and Feng Wen "Resonant-cavity based monolithic white light-emitting diode", Proc. SPIE 6782, Optoelectronic Materials and Devices II, 678222 (19 November 2007); https://doi.org/10.1117/12.741391

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