Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 26, Issue 1, Pages 36-43Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201502870
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Funding
- Special Funds for Major State Basic Research Project [2011CB301900]
- National Nature Science Foundation of China [61274003, 61422401, 51461135002, 61334009]
- Nature Science Foundation of Jiangsu Province [BK2011010, BY2013077]
- Solid State Lighting and Energy-saving Electronics Collaborative Innovation Center
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Scientific Innovation Research of College Graduate in Jiangsu Province [CXZZ12_0052]
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An excellent hybrid III-nitride/nanocrystal nanohole light-emitting diode (h-LED) has been developed utilizing nonradiative resonant energy transfer (NRET) between violet/blue emitting InGaN/GaN multiple quantum wells (MQWs) and various wavelength emitting nanocrystals (NCs) as color-conversion mediums. InGaN/GaN MQWs are fabricated into nanoholes by soft nanoimprint lithography to minimize the separation between MQWs and NCs. A significant reduction in the decay lifetime of excitons in the MQWs of the hybrid structure has been observed as a result of the NRET from the nitride emitter to NCs. The NRET efficiency of the hybrid structures is obtained from the decay curves, as high as 80%. Moreover, a modified Forster formulation has exhibited that the exciton coupling distance in the hybrid structures is less than the Forster's radius, demonstrating a strong coupling between MQWs and NCs. Finally, based on a systemic optimization for white emission indexes, a series of hybrid ternary complementary color h-LEDs have been demonstrated with a high color rendering index, up to 82, covering the white light emission at different correlated color temperatures ranging from 2629 to 6636 K, corresponding to warm white, natural white, and cold white.
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