Single-exponential solid-state delayed fluorescence decay in TADF compounds with minimized conformational disorder,Journal of Materials Chemistry C

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Single-exponential solid-state delayed fluorescence decay in TADF compounds with minimized conformational disorder
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2021-1-4 , DOI: 10.1039/d0tc05503d
Tomas Serevičius _{1,

2,

3,

4} , Rokas Skaisgiris _{1,

2,

3,

4} , Irina Fiodorova _{2,

4,

5,

6} , Gediminas Kreiza _{1,

2,

3,

4} , Dovydas Banevičius _{1,

2,

3,

4} , Karolis Kazlauskas _{1,

2,

3,

4} , Sigitas Tumkevičius _{2,

4,

5,

6} , Saulius Juršėnas _{1,

2,

3,

4}

Affiliation

Thermally activated delayed fluorescence (TADF) compounds with rapid triplet upconversion in solutions frequently yield drastically lowered upconversion rates in solid hosts due to the conformational disorder, resulting in prolonged multiexponential TADF decay profiles. The dispersion of singlet–triplet gaps was shown to be the nature of this unwanted effect, minimized in compounds with more sterically confined molecular structure, though the observation of low solid-state disorder still is scarce. Therefore, here we present the unambiguous realization of rapid single-exponential solid-state TADF decay in the optimized acridine–pyrimidine TADF compound ACRPyr. The compound was designed to have a rigid molecular structure with negligible conformational disorder along with small singlet–triplet energy gaps, leading to rapid solid-state TADF with a lifetime of about 1.76 μs, a fluorescence quantum yield of about 0.67 and an exceptional rISC rate of 5.7 × 10⁶ s⁻¹. Furthermore, the ACRPyr based sky-blue OLED device showed a peak EQE of 14.3% with minor roll-off.

中文翻译：

具有最小构象障碍的TADF化合物的单指数固态延迟荧光衰减

在溶液中具有快速三重态上转换的热激活延迟荧光（TADF）化合物由于构象紊乱，经常在固体宿主中产生急剧降低的上转换速率，从而导致延长的多指数TADF衰减曲线。单线态-三重态间隙的分散被证明是这种不良作用的本质，尽管对低固态障碍的观察仍然很少，但在具有更受空间限制的分子结构的化合物中，这种作用被最小化了。因此，在这里，我们展示了在优化的a啶-嘧啶TADF化合物ACRPyr中快速单指数固态TADF衰减的明确实现。。该化合物设计为具有可忽略的构象紊乱的刚性分子结构，以及小的单重态-三重态能隙，可产生快速的固态TADF，寿命约为1.76μs，荧光量子产率约为0.67，且rISC速率极高为5.7×10 ⁶ s ^-1。此外，基于ACRPyr的天蓝色OLED器件显示出14.3％的峰值EQE，且滚降很小。

更新日期：2021-01-20

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