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史益忠博士后的论文“Characterizing Conformational Distribution in Amorphous Film of Organic Emitter and Its Application in “Self-Doping” Organic Light-Emitting Diode”发表在Angew. Chem. Int. Ed. 上

时间:2021-12-01关键词:张晓宏教授团队浏览量:363
  • Abstract: The conformational distribution and mutual inter-conversion of thermally activated delayed fluorescence (TADF) emitters significantly affect the exciton utilization. However, their influence on the photophysics in amorphous film states is still not known due to the lack of a suitable quantitative analysis method. Herein, we used temperature-dependent time-resolved photoluminescence spectroscopy to quantitatively measure the relative populations of the conformations of a TADF emitter for the first time. We further propose a new concept of “self-doping” for realizing highefficiency nondoped OLEDs. Interestingly, this “compositionally” pure film actually behaves as a film with a dopant (quasi-equatorial form) in a matrix (quasi-axial form). The concentration-induced quenching that may occur at high concentrations is thus expected to be effectively relieved. The “self-doping” OLED prepared with the newly developed TADF emitter TP2P-PXZ as a neat emitting layer realizes a high maximum external quantum efficiency of 25.4% and neglectable efficiency roll-off.


链接https://onlinelibrary.wiley.com/doi/10.1002/anie.202108943