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Efficient full-colour organic light-emitting diodes based on donor–acceptor electroluminescent materials with a reduced singlet–triplet splitting energy gap

机译:基于施主-受体电致发光材料的高效全色有机发光二极管,具有减小的单重态-三重态分裂能隙

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A series of efficient blue-emitting materials, namely, Cz-DPVI, Cz-DMPVI, Cz-DEPVI and TPA-DEPVI, possessing a donor–acceptor architecture with dual carrier transport properties and small singlet–triplet splitting is reported. These compounds exhibit excellent thermal properties with a very high glass-transition temperature ( T _(g) ), and thus, a stable uniform thin film was formed during device fabrication. Among the weak donor compounds, specifically, Cz-DPVI, Cz-DMPVI and Cz-DEPVI, the Cz-DEPVI-based device showed the maximum efficiencies ( L : 13?955 cd m ~(?2) , η _(ex) : 4.90%, η _(c) : 6.0 cd A ~(?1) , and η _(p) : 5.4 lm W ~(?1) ) with CIE coordinates of (0.15, 0.06) at 2.8 V. The electroluminescent efficiencies of Cz-DEPVI were higher than that of the strong donor TPA-DEPVI-based device ( L : 13?856 cd m ~(?2) , η _(ex) : 4.70%, η _(c) : 5.7 cd A ~(?1) , and η _(p) : 5.2 lm W ~(?1) ). Furthermore, these blue emissive materials were used as hosts to construct efficient green and red phosphorescent OLEDs. The green device based on Cz-DEPVI:Ir(ppy) _(3) exhibited the maximum L of 8891 cd m ~(?2) , η _(ex) of 19.3%, η _(c) of 27.9 cd A ~(?1) and η _(p) of 33.4 lm W ~(?1) with CIE coordinates of (0.31, 0.60) and the red device based on Cz-DEPVI:Ir(MQ) _(2) (acac) exhibited the maximum L of 40?565 cd m ~(?2) , η _(ex) of 19.9%, η _(c) of 26.0 cd A ~(?1) and η _(p) of 27.0 lm W ~(?1) with CIE coordinates of (0.64, 0.37).
机译:据报道,一系列高效的发蓝光材料,即Cz-DPVI,Cz-DMPVI,Cz-DEPVI和TPA-DEPVI,具有具有双载流子传输特性和小的单重态-三重态分裂的施主-受主结构。这些化合物在非常高的玻璃化转变温度(T _(g))下表现出优异的热性能,因此,在器件制造期间形成了稳定均匀的薄膜。在弱供体化合物中,特别是Cz-DPVI,Cz-DMPVI和Cz-DEPVI中,基于Cz-DEPVI的器件显示出最大效率(L:13-955 cd m〜(?2),η_(ex) :4.90%,η_(c):6.0 cd A〜(?1),η_(p):5.4 lm W〜(?1))在2.8 V时的CIE坐标为(0.15,0.06)。 Cz-DEPVI的效率高于基于强供体TPA-DEPVI的设备的效率(L:13?856 cd m〜(?2),η_(ex):4.70%,η_(c):5.7 cd A〜(?1)和η_(p):5.2 lm W〜(?1))。此外,这些蓝色发光材料被用作主体,以构建有效的绿色和红色磷光OLED。基于Cz-DEPVI:Ir(ppy)_(3)的绿色器件的最大L值为8891 cd m〜(?2),η_(ex)为19.3%,η_(c)为27.9 cd A〜 (?1)和η_(p)为33.4 lm W〜(?1),CIE坐标为(0.31,0.60),并且展示了基于Cz-DEPVI:Ir(MQ)_(2)(acac)的红色设备最大L为40〜565 cd m〜(?2),η_(ex)为19.9%,η_(c)为26.0 cd A〜(?1),η_(p)为27.0 lm W〜( CIE坐标为(0.64,0.37)的α1)。

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