Journal
APPLIED PHYSICS LETTERS
Volume 109, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4964403
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Funding
- National Key Research and Development Project [2016YFB0400102]
- Hi-tech Research Project [2014AA032605, 2015AA033305]
- National Nature Science Foundation of China [61274003, 61422401, 51461135002, 61334009]
- Nature Science Foundation of Jiangsu Province [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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Blue InGaN/GaN nanohole light-emitting diodes have been fabricated by soft UV-curing nanoimprint lithography, filling with CdSe/ZnS core/shell nanocrystals (NCs) as color conversion mediums. The excitonic recombination dynamics of hybrid nanohole light-emitting diodes were investigated by time-resolved photoluminescence, observing a significant reduction in the decay lifetime of excitons as a result of an efficient non-radiative resonant energy transfer, which leads to the improvement of color conversion and efficiency droop in these hybrid nanohole light-emitting diodes compared to hybrid nanocrystals/standard planar light-emitting diodes. The color-conversion efficiency and effective quantum yield of hybrid nanohole light-emitting diodes were nearly twice as much as those of hybrid standard light-emitting diodes. A model on the excitonic recombination process was proposed to explore this situation, explaining the advantages of non-radiative resonant energy transfer that avoiding energy loss associated with the intermediate light emission and conversion steps and transferring energy non-radiatively and resonantly to NCs with a higher quantum yield. The efficiency droop of hybrid nanohole light-emitting diodes was validly suppressed compared to the bare ones, even better than that of hybrid standard light-emitting diodes. It mainly results from the extraction of excess carrier concentrations in InGaN/GaN multiple quantum wells via the rapid non-radiative resonant energy transfer process under the higher injection condition, revealing a great potential to realize efficient white light emitters in the future. Published by AIP Publishing.
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