Xu Zhen, Hean Duane, Yuan Jennifer, Wolf Michael O
Department of Chemistry, University of British Columbia 2036 Main Mall Vancouver BC V6T 1Z1 Canada
Chem Sci. 2022 May 30;13(23):6882-6887. doi: 10.1039/d2sc01922a. eCollection 2022 Jun 15.
Two-component crystalline organic alloys with a wide range of compositional ratios (from 30% to 90% of one component) are employed to tune excited-state lifetimes and photoluminescence quantum yields (PLQYs). Alloy crystals exhibit homogeneous distribution of parent compounds by X-ray crystallography and differential scanning calorimetry. The alloys display a 1.5- to 5-fold enhancement in thermally activated delayed fluorescence (TADF) lifetime, compared to the parent compounds. PLQYs can also be tuned by changing alloy composition. The reverse intersystem crossing and long-lived lifetime of the parent compounds give rise to long-lived TADF in the alloys. Organic alloys enable tunability of both lifetime and efficiency, providing a new perspective on the development of organic long-lived emissive materials beyond the rules established for host-guest doped systems.
具有广泛组成比（一种组分占30%至90%）的双组分结晶有机合金被用于调节激发态寿命和光致发光量子产率（PLQYs）。通过X射线晶体学和差示扫描量热法可知，合金晶体呈现出母体化合物的均匀分布。与母体化合物相比，这些合金的热激活延迟荧光（TADF）寿命提高了1.5至5倍。PLQYs也可以通过改变合金组成来调节。母体化合物的反向系间窜越和长寿命导致合金中出现长寿命TADF。有机合金能够实现寿命和效率的可调性，为有机长寿命发光材料的开发提供了一个新的视角，超越了为主客体掺杂体系所确立的规则。
