基于Acridin-9（10H）-one的热活化延迟荧光材料：RISC和辐射工艺的同时优化，以提高发光效率,Journal of Materials Chemistry C

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基于Acridin-9（10H）-one的热活化延迟荧光材料：RISC和辐射工艺的同时优化，以提高发光效率
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2021-3-23 , DOI: 10.1039/d1tc00592h
Yongqiang Mei _{1,

2,

3,

4,

5} , Di Liu _{1,

2,

3,

4,

5} , Jiuyan Li _{1,

2,

3,

4,

5} , Huiting Li _{1,

2,

3,

4,

5} , Wenkui Wei _{1,

2,

3,

4,

5}

Affiliation

强烈期望热活化的延迟荧光（TADF）化合物同时具有高辐射速率常数（K _R）和高反向体系内交叉速率（K _RISC）。以苯并恶嗪为电子，设计了一种新型TADF化合物3,6-二（10 H-吩恶嗪-10-基）-10-苯基ac啶9-9（10 H）-one（3,6-DPXZ-AD） acridin-9（10 H）-的3,6-位点的供体是一个受体。cri啶酮环的氮原子独特的sp ^2-杂化导致准赤道构象和3,6-DPXZ-AD的高分子刚性，从而抑制构象松弛并最终产生高K _R为1.4×10 ⁷ s ^-1。3,6-DPXZ-AD的磷光具有出乎意料的更高能量，其磷光被证明源自分子间通空间电荷转移状态（TSCT）和局部激发的三重态（³ LE）。由于从TSCT和³ LE状态到¹ CT状态的多通道RISC过程，因此1.1×10 ⁶ s ^-1的高K _RISC同时实现。3,6-DPXZ-AD的TADF寿命短，为1.6μs，荧光量子产率高，为94.9％。以3,6-DPXZ-AD作为掺杂发射极的黄色有机发光二极管具有出色的性能，具有2.2 V的低导通电压，30.6％的外部量子效率和109.9 lm W ^-1的功率效率。，是基于a啶酮的材料所报告的最佳价值之一。

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Acridin-9(10H)-one based thermally activated delayed fluorescence material: simultaneous optimization of RISC and radiation processes to boost luminescence efficiency

It is strongly desired for thermally activated delayed fluorescence (TADF) compounds to possess a high rate constant of radiation (K_R) and a high rate constant of reverse intersystem crossing (K_RISC) simultaneously. A novel TADF compound, 3,6-di(10H-phenoxazin-10-yl)-10-phenylacridin-9(10H)-one (3,6-DPXZ-AD), is designed by attaching phenoxazine as the electron donor at the 3,6-sites of acridin-9(10H)-one as the acceptor. The unique sp²-hybridization of the nitrogen atom of the acridone ring leads to the quasi-equatorial conformation and the high molecular rigidity of 3,6-DPXZ-AD, which suppress conformation relaxation and finally generate a high K_R of 1.4 × 10⁷ s⁻¹. The phosphorescence of 3,6-DPXZ-AD with unexpected higher energy than its fluorescence is proved to originate from the intermolecular through-space charge transfer state (TSCT) and the locally excited triplet states (³LE). Due to the multichannel RISC process from the TSCT and ³LE states to the ¹CT state, a high K_RISC of 1.1 × 10⁶ s⁻¹ is realized simultaneously. 3,6-DPXZ-AD shows a short TADF lifetime of 1.6 μs and a high fluorescence quantum yield of 94.9%. The yellow organic light-emitting diode with 3,6-DPXZ-AD as the doped emitter exhibits excellent performance with a low turn-on voltage of 2.2 V, an external quantum efficiency of 30.6% and a power efficiency of 109.9 lm W⁻¹, being among the best values ever reported for acridone based materials.

更新日期：2021-04-29

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