Abstract
Thermally activated delayed fluorescent (TADF) materials, as the third generation of organic electroluminescent materials, have many advantages over other organic light-emitting diodes (OLEDs) materials, such as 100% internal quantum efficiency, no doping of heavy metals, and avoiding the shortages of ordinary fluorescent materials and phosphorescent materials. So it is considered to be the most competitive organic light-emitting materials, and has great application prospects in the field of OLEDs. So far, small-molecule TADF materials have achieved high quantum yield and full-color range of red, green, and blue. However, TADF polymers suitable for low-cost and easily scalable solution processing are less developed, which are confined by the preparation methods and polymers designing, and there are still challenges of increasing quantum efficiency and strengthening device performance. This review mainly summarizes different synthesis strategies of TADF polymers and the latest development in the field. Special attention is focused on illustrating the designing and structure-property relationship of TADF polymers, and finally, an outlook is given for the design and application prospect of TADF polymers in the future.
Highlights
organic light-emitting diodes (OLEDs) are high-brightness, wide-view, and fully cured light emitting devices
The results indicated that these propeller-like structured dendrimers exhibited Thermally activated delayed fluorescent (TADF) and aggregation-induced emission (AIE) effects in OLEDs prepared by solution processing
A non-doped OLED device prepared by solution method, in which the synthesized intermonomer TADF polymer acted as emitting layer, emitted in a green region, having a maximum external quantum yield (EQE) up to 10%, and a Commission Internationale de l’Eclairage (CIE) coordinate of (0.32, 0.58)
Summary
OLEDs are high-brightness, wide-view, and fully cured light emitting devices. As OLEDs have the advantages of low driving voltage, fast response speed, high luminous efficiency, simple manufacturing process and easy panchromatic display, they are considered as “Fantastic display,” and one of the most important flat-panel display technologies in the future (Sheats et al, 1996). Activated delayed fluorescent (TADF) materials have a totally different luminescence mechanism, in which the exciton transition from triplet excited state to singlet excited state occurred through reverse inter-system crossing (RISC), thereby transition radiative emission (Nakagawa et al, 2012; Tanaka et al, 2012; Uoyama et al, 2012). Those materials have different luminescence mechanisms, the structure and working principle are similar when they are used as emitting layer in OLED devices. It is easy to achieve the reverse inter-system crossing under the thermal activation condition, thereby converting the triplet excitons into singlet excitons and accomplishing 100% internal quantum efficiency
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