高效无掺杂 OLED 器件，由聚集诱导延迟荧光发光材料制备，效率滚降可忽略不计。
Highly Efficient Nondoped OLEDs with Negligible Efficiency Roll-Off Fabricated from Aggregation-Induced Delayed Fluorescence Luminogens.
机构信息
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China.
Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China.
出版信息
Angew Chem Int Ed Engl. 2017 Oct 9;56(42):12971-12976. doi: 10.1002/anie.201706752. Epub 2017 Sep 13.
Purely organic emitters that can efficiently utilize triplet excitons are highly desired to cut the cost of organic light-emitting diodes (OLEDs), but most of them require complicated doping techniques for their fabrication and suffer from severe efficiency roll-off. Herein, we developed novel luminogens with weak emission and negligible delayed fluorescence in solution but strong emission with prominent delayed components upon aggregate formation, giving rise to aggregation-induced delayed fluorescence (AIDF). The concentration-caused emission quenching and exciton annihilation are well-suppressed, which leads to high emission efficiencies and efficient exciton utilization in neat films. Their nondoped OLEDs provide excellent electroluminescence efficiencies of 59.1 cd A , 65.7 lm W , and 18.4 %, and a negligible current efficiency roll-off of 1.2 % at 1000 cd m . Exploring AIDF luminogens for the construction of nondoped OLEDs could be a promising strategy to advance device efficiency and stability.
人们非常希望使用纯有机发射体来制造高效利用三重态激子的有机发光二极管（OLED），以降低成本，但大多数此类发射体需要复杂的掺杂技术来制备，并且存在严重的效率滚降问题。在此，我们开发了新型发光体，它们在溶液中具有较弱的发光和可忽略的延迟荧光，但在聚集态形成时具有较强的发光，表现出明显的延迟成分，从而产生聚集诱导延迟荧光（AIDF）。聚集引起的发光猝灭和激子湮灭得到了很好的抑制，从而导致在纯膜中具有高的发光效率和有效的激子利用。它们的非掺杂 OLED 提供了优异的电致发光效率，分别为 59.1 cd/A、65.7 lm/W 和 18.4%，并且在 1000 cd/m 时电流效率滚降可忽略不计，仅为 1.2%。探索用于构建非掺杂 OLED 的 AIDF 发光体可能是提高器件效率和稳定性的一种很有前途的策略。
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