Abstract
Hybrid white organic light-emitting diodes (WOLEDs) have drawn great attention both for display and solid-state lighting purposes because of the combined advantages of desirable stability of fluorescent dyes and high efficiency of phosphorescent materials. However, in most WOLEDs, obtaining high efficiency often requires complex device structures. Herein, we achieved high-efficiency hybrid WOLEDs using a simple but efficacious structure, which included a non-doped blue emissive layer (EML) to separate the exciton recombination zone from the light emission region. After optimization of the device structure, the WOLEDs showed a maximum power efficiency (PE), current efficiency (CE), and external quantum efficiency (EQE) of 82.3 lm/W, 70.0 cd/A, and 22.2%, respectively. Our results presented here provided a new option for promoting simple-structure hybrid WOLEDs with superior performance.
Highlights
White organic light-emitting diodes (WOLEDs), which exhibit splendid properties such as high-quality white light without glare and toxic substances, fabrication flexibility, low power consumption, and high luminous efficiency, are widely regarded as a desirable solid-state light source and an indispensable layer for television and micro displays [1,2,3]
WOLEDs can be classified in three ways: all-fluorescent, all-phosphorescent, and hybrid [4,5]
WOLEDs, which often suffer from low efficiency or short lifetime, the hybrid WOLED strategy has been regarded as a feasible method to obtain devices with high performance [6,7,8], as they can combine the advantages of long-lifetime blue fluorophores and high-efficiency red and green phosphors [9,10,11]
Summary
White organic light-emitting diodes (WOLEDs), which exhibit splendid properties such as high-quality white light without glare and toxic substances, fabrication flexibility, low power consumption, and high luminous efficiency, are widely regarded as a desirable solid-state light source and an indispensable layer for television and micro displays [1,2,3]. WOLEDs, which often suffer from low efficiency or short lifetime, the hybrid WOLED strategy has been regarded as a feasible method to obtain devices with high performance [6,7,8], as they can combine the advantages of long-lifetime blue fluorophores and high-efficiency red and green phosphors [9,10,11]. For single-EML hybrid WOLEDs, the triplet energy (T1) of blue fluorescent emitters should be higher than that of the phosphorescent emitters to facilitate efficient energy transfer processes when doping phosphors into the fluorophore host or when doping fluorophores and phosphors in the host together [13,16,17,18].
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