Highly efficient non-doped blue organic electroluminescent  devices based on BCzVB

Abstract

Abstract: Efficient non-doped blue organic light-emitting device with a structure of ITO/MoO₃/TAPC (1,1-bis((di-4-tolylamino)phenyl)cyclohexane,50 nm)/BCzVB (1,4-bis[2-(3-N-ethylcarbazoryl) vinyl]benzene,x nm)/CBP (4,4’-N,N’-dicarbazole-biphyenyl,20 nm)/BCzVB (x nm)/TPBi (1,3,5-tris(1-phenyl-1H-benzimidazol -2-yl)benzene,20 nm)/LiF (1.5 nm)/Al were reported, in which two ultrathin layers of BCzVB as blue emitters were located at both the sides of ambipolar material CBP. When the thickness of BCzVB is 0.3 nm, the maximum luminance and external quantum efficiencyare 12 800 cd/cm² and 2.1% (current efficiency is 2.8 cd/A),respectively, and CIE-1931 coordinate is (0.15,0.17). The device performance is further improved by optimizing the thickness of the hole injection layer MoO₃. The maximum luminance and external quantum efficiency reach 14 200 cd/cm² and 4.2% (5.66 cd/A),respectively, which is so far the highest efficiency for BCzVB based blue OLED reported in the literature.

Key words: fluorescence, organic light-emitting devices, BCzVB, non-doped, blue

CLC Number:

ZOU Wen-jing, WU You-zhi, ZHANG Cai-rong. Highly efficient non-doped blue organic electroluminescent devices based on BCzVB[J]. Journal of Lanzhou University of Technology, 2024, 50(3): 21-26.

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Highly efficient non-doped blue organic electroluminescent devices based on BCzVB

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