Controlling the electronic structures of triphenylene based sky blue TADF emitters by chemical modifications for high efficiency with shorter emission lifetimes
Controlling the electronic structures of triphenylene based sky blue TADF emitters by chemical modifications for high efficiency with shorter emission lifetimes
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DOI：
10.1016/j.cej.2022.134925
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发表时间：
2022-01
影响因子：
15.1
通讯作者：
Kengo Kumada;Hisahiro Sasabe;Kohei Nakao;Misaki Matsuya;Taito Noda;Hiroki Arai;J. Kido
中科院分区：
文献类型：
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作者：
Kengo Kumada;Hisahiro Sasabe;Kohei Nakao;Misaki Matsuya;Taito Noda;Hiroki Arai;J. Kido
化学修饰的三苯基衍生物由于其刚性结构和2.9 eV的高三重态能量，是实现高效蓝色热激活延迟荧光（TADF）发射器的有吸引力的受体单位之一，但迄今为止报道的外量子效率（EQE）低于10%的例子有限。在这里，我们开发了三种基于改性三苯基受体单元的蓝色TADF发射器。这些发射体呈现天蓝色发射，发射峰波长约为470 nm，高光致发光量子产率（PLQY）为~ 88%，延迟寿命（τd）为~ 7.7 μs。这些发射器实现了高效的天蓝有机发光装置，EQE高达20%以上。
Chemically modified triphenylene derivatives are one of the attractive candidates as an acceptor unit for realizing efficient blue thermally activated delayed fluorescence (TADF) emitters due to the rigid structure and the high triplet energy of 2.9 eV however, only a limited number of examples with low external quantum efficiency (EQE) below 10% are reported to date. Here, we developed three types of blue TADF emitters based on modified triphenylene acceptor units. These emitters showed sky blue emission with the emission peak wavelength around 470 nm, high photoluminescent quantum yield (PLQY) of ∼88%, and a short delayed lifetime (τd) of ∼7.7 μs. These emitters realized efficient sky blue organic light-emitting device with high EQE of over 20%.