Lee In Hye, Kim Ki Ju, Kim Young Kwan, Kim Young Sik, Shin Dong Myung
Department of Chemical Engineering, Hongik University, Seoul 04066, Korea.
Department of Information Display, Hongik University, Seoul 04066, Korea.
J Nanosci Nanotechnol. 2019 Aug 1;19(8):4583-4589. doi: 10.1166/jnn.2019.16702.
Novel blue thermally activated delayed fluorescence (TADF) emitters, and , were designed and synthesized. Diphenyl sulfone (DPS) group functioned as a common acceptor, and it combined with each of two different spiro-acridine groups, D1 and D2. The calculated energy differences (Δ) of the singlet and triplet excited states of (0.062 eV) and (0.128 eV) had sufficiently small Δ values, which is favorable in the thermally activated reverse intersystem crossing (RISC) process from the T state to the S state. A device doped 10 wt% of D2-DPS with ADN host material, obtained 5.05% of external quantum efficiency with deep-blue emission having CIE coordinates of (0.152, 0.065). The results showed that these molecules are promising host-free TADF deep-blue emitters by inhibiting concentration quenching.
设计并合成了新型蓝色热激活延迟荧光（TADF）发光体 和 。二苯砜（DPS）基团作为常见的受体，它与两种不同的螺吖啶基团D1和D2分别结合。 （0.062 eV）和 （0.128 eV）的单重态和三重态激发态的计算能量差（Δ）具有足够小的Δ值，这有利于从T态到S态的热激活反向系间窜越（RISC）过程。一种掺杂10 wt% D2-DPS与ADN主体材料的器件，获得了5.05%的外量子效率，发出深蓝色光，CIE坐标为（0.152, 0.065）。结果表明，这些分子通过抑制浓度猝灭有望成为无主体TADF深蓝色发光体。
