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热活化延迟荧光材料由于其最低激发单重态和最低激发三重态之间的能级差较小,三重态激子可以通过反向系间窜越过程上转换到单重态,实现无贵金属添加的三重态激子参与的荧光发射,大大提高了发光效率,解决了传统荧光有机发光二极管(OLED)内/外量子效率(≤25%/≤5%)低下的问题;与磷光OLED相比,避免了使用贵金属,在造价方面具有更大优势.在类型众多的热活化延迟荧光(TADF)材料中,由于电子给体-受体型分子合成简单,性能出众而成为近年来的研究热点.另一方面,高效蓝光材料的稳定性及色纯度问题一直是该领域研究亟待解决的难题.本文将依据不同电子给受体单元,对电子给体-受体型热活化延迟荧光蓝光材料及其OLED器件的最新进展、发光原理和设计原则进行了简要综述,并对其发展作出展望.
The thermally activated delayed fluorescent material, due to its small energy level difference between its lowest excited triplet and the lowest excited triplet, can be converted to the singlet state by intersystem crossing, enabling the addition of The fluorescence emission involved in triplet excitons greatly improves the luminous efficiency and solves the problem of low internal quantum efficiency (≤25% / ≤5%) in traditional fluorescent organic light-emitting diodes (OLEDs). Compared with phosphorescent OLEDs, With the use of precious metals, it has more advantages in terms of cost.In many kinds of TADF materials, the electron donor-acceptor molecule has become a hotspot in recent years due to its simplicity of synthesis and superior performance. , The problem of the stability and color purity of highly efficient blue material has been a pressing problem to be solved urgently in this field.In this paper, based on different electron acceptor units, the electron donor-acceptor type heat activated delayed fluorescent blue material and its OLED device The latest progress, the principle of luminescence and design principles were briefly reviewed, and its development prospects.