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Rational Molecular Design of Dibenzo[a,c]phenazine-Based Thermally Activated Delayed Fluorescence Emitters for Orange-Red OLEDs with EQE up to 22.0%
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-06-19 00:00:00 , DOI: 10.1021/acsami.9b06401 Feng-Ming Xie 1 , Hao-Ze Li 1 , Guo-Liang Dai 1 , Yan-Qing Li 2 , Tao Cheng 2 , Miao Xie 2 , Jian-Xin Tang 2 , Xin Zhao 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-06-19 00:00:00 , DOI: 10.1021/acsami.9b06401 Feng-Ming Xie 1 , Hao-Ze Li 1 , Guo-Liang Dai 1 , Yan-Qing Li 2 , Tao Cheng 2 , Miao Xie 2 , Jian-Xin Tang 2 , Xin Zhao 1
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The design and synthesis of highly efficient thermally activated delayed fluorescence (TADF) emitters with an electroluminescence wavelength beyond 600 nm remains a great challenge for organic light-emitting diodes (OLEDs). To solve this issue, three TADF molecules, xDMAC–BP (x = 1, 2, 3), are developed in combination with the rigid planar dibenzo[a,c]phenazine (BP) acceptor core and different numbers of 9,9-dimethylacridan (DMAC) donors. All these emitters possess stable internal charge transfer and a large dihedral angle between the donors and planar BP core. The emission wavelength can be regulated from 541 to 605 nm by increasing the number of the donor DMAC units because of the controllable tuning of the intramolecular charge transfer effect and the molecular geometrical structure. The photoluminescence quantum yields of these emitters are improved from 42 to 89% with the increase in the number of DMAC units. The orange-red OLEDs employing the xDMAC–BP emitters exhibit maximum external quantum efficiency (EQE) of 22.0% at 606 nm, which is the highest EQE of the previously reported TADF OLEDs exceeding 600 nm.
中文翻译：
基于二苯并[ a，c ]吩嗪的热活化延迟荧光发射剂的合理分子设计，用于EQE高达22.0％的橙红色OLED
电致发光波长超过600 nm的高效热激活延迟荧光（TADF）发射器的设计和合成仍然是有机发光二极管（OLED）的巨大挑战。为了解决这个问题，开发了三个TADF分子x DMAC–BP（x = 1，2，3）与刚性平面二苯并[ a，c]吩嗪（BP）受体核心和不同数量的9,9-二甲基ac啶（DMAC）供体。所有这些发射极都具有稳定的内部电荷传输，并且在施主和平面BP磁芯之间具有大的二面角。由于分子内电荷转移效应和分子几何结构的可控调节，可以通过增加施主DMAC单元的数量将发射波长调节在541至605 nm之间。随着DMAC单元数量的增加，这些发射器的光致发光量子产率从42％提高到89％。采用x DMAC-BP发射器的橙红色OLED在606 nm处具有22.0％的最大外部量子效率（EQE），这是先前报道的TADF OLED超过600 nm的最高EQE。
更新日期：2019-06-19
中文翻译：
基于二苯并[ a，c ]吩嗪的热活化延迟荧光发射剂的合理分子设计，用于EQE高达22.0％的橙红色OLED
电致发光波长超过600 nm的高效热激活延迟荧光（TADF）发射器的设计和合成仍然是有机发光二极管（OLED）的巨大挑战。为了解决这个问题，开发了三个TADF分子x DMAC–BP（x = 1，2，3）与刚性平面二苯并[ a，c]吩嗪（BP）受体核心和不同数量的9,9-二甲基ac啶（DMAC）供体。所有这些发射极都具有稳定的内部电荷传输，并且在施主和平面BP磁芯之间具有大的二面角。由于分子内电荷转移效应和分子几何结构的可控调节，可以通过增加施主DMAC单元的数量将发射波长调节在541至605 nm之间。随着DMAC单元数量的增加，这些发射器的光致发光量子产率从42％提高到89％。采用x DMAC-BP发射器的橙红色OLED在606 nm处具有22.0％的最大外部量子效率（EQE），这是先前报道的TADF OLED超过600 nm的最高EQE。
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