A sensitization strategy for highly efficient blue fluorescent organic light-emitting diodes

Autor: Yalei Duan, Runda Guo, Yaxiong Wang, Kaiyuan Di, Lei Wang
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Frontiers of Optoelectronics, Vol 15, Iss 1, Pp 1-12 (2022)
Druh dokumentu: article
ISSN: 2095-2759
2095-2767
DOI: 10.1007/s12200-022-00046-z
Popis: Abstract Highly efficient blue fluorescent materials have recently attracted great interest for organic light-emitting diode (OLED) application. Here, two new pyrene based organic molecules consisting of a highly rigid skeleton, namely SPy and DPy, are developed. These two blue light emitters exhibit excellent thermal stability. The experiment reveals that the full-width at half-maximum (FWHM) of the emission spectrum can be tuned by introducing different amounts of 9,9-diphenyl-N-phenyl-9H-fluoren-2-amine on pyrene units. The FWHM of the emission spectrum is only 37 nm in diluted toluene solution for DPy. Furthermore, highly efficient blue OLEDs are obtained by thermally activated delayed fluorescence (TADF) sensitization strategy. The blue fluorescent OLEDs utilizing DPy as emitters achieve a maximum external quantum efficiency (EQE) of 10.4% with the electroluminescence (EL) peak/FWHM of 480 nm/49 nm. Particularly, the EQE of DPy-based device is boosted from 2.6% in non-doped device to 10.4% in DMAc-DPS TADF sensitized fluorescence (TSF) device, which is a 400% enhancement. Therefore, this work demonstrates that the TSF strategy is promising for highly efficient fluorescent OLEDs application in wide-color-gamut display field. Graphical Abstract
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