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Solution‐Processed White Circularly Polarized Organic Light‐Emitting Diodes Based on Chiral Binaphthyl Emitters
Author(s) -
Zhang Yu,
Li Jie,
Quan Yiwu,
Ye Shanghui,
Cheng Yixiang
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202003721
Subject(s) - oled , luminance , diode , materials science , doping , optoelectronics , brightness , photonics , voltage , excitation , optics , layer (electronics) , physics , nanotechnology , quantum mechanics
Abstract By combining the blue and orange CPL or functionalized bis‐benzoxanethones emitters ( S ‐/ R ‐ BN‐tCz and S ‐/ R ‐ BN‐PXZ ), warm white CP‐OLEDs were fabricated using solution‐processed single emitting layer strategy. The successful realization of white CP‐EL benefited from the same stable binaphthyl chirality and similar rigid structure of the two emissive CPL emitters. The devices exhibited the low turn‐on voltage of ≈4.3 V, maximum luminance of ≈10200 cd m −2 and maximum current efficiency of ≈2.0 cd A −1 . Most significantly, the devices with CIE coordinates of (0.32, 0.45) displayed intense CP‐EL signals in the spectral range of 450 to 650 nm, and showed stable g EL values of ≈10 −3 as the luminance increased from 100 to 6000 cd m −2 . To the best of our knowledge, this work provides for the first time a simple and feasible strategy to fabricate solution‐processed white CP‐OLEDs based on the co‐doping of the CPL emitters.