TY - JOUR
T1 - Classic Fluorophores With a Horizontal Alignment for Enhancing Light Outcoupling Efficiency (≈30%) and External Quantum Efficiency (≈7%) of Near Ultraviolet (λmax < 400 nm) Organic Light-Emitting Diodes
AU - Lee, Jian Haur
AU - Huang, Jing Xiang
AU - Chen, Chia Hsun
AU - Lee, Yi Ting
AU - Chan, Chin Yiu
AU - Dzeng, Yi Chung
AU - Tang, Po Wen
AU - Chen, Chi
AU - Adachi, Chihaya
AU - Chiu, Tien Lung
AU - Lee, Jiun Haw
AU - Chen, Chin Ti
N1 - Funding Information:
The authors thank the Ministry of Science and Technology (MOST 109‐2113‐M‐001‐018‐; 110‐2113‐M‐001‐023‐; 111‐2113‐M‐001‐042‐), iMATE Program of Academia Sinica, and the National Taiwan University.
Publisher Copyright:
© 2023 Wiley-VCH GmbH.
PY - 2023
Y1 - 2023
N2 - Based on the classic 1,1′:4′,1″-terphenyl fluorophore, a novel near-ultraviolet (NUV) fluorescent BB4Ph (4,4″′-bis(2,3,4,5-tetraphenylphen-1-yl)(1,1′:4′,1″-terphenyl) is designed, synthesized, and characterized. BB4Ph exhibits a NUV fluorescence with a λmax of 373 and 380 nm in solution and as a thin film, respectively. The grazing incidence wide-angle X-ray scattering (GIWAXS) reveals BB4Ph having a high value of order parameter (SGIWAXS) of 0.59 for a molecular layer array normal to the substrate; the angle-dependent photoluminescence (ADPL) measurement shows Θ (horizontal–dipole ratios) as high as 95% with the neat film. The non-doped BB4Ph organic light-emitting diodes (OLEDs) show external quantum efficiency (EQE) up to 5.24% with 1931 Commission Internationale de l’ Eclairage coordinates (CIEx,y) of (0.16, 0.04), a NUV electroluminescence. With 4P-Cz (9,9′-(1,1′:4′,1″:4″,1′″-quaterphenyl-4,4′″-diyl)dicarbazole) as a dopant emitter, doped BB4Ph OLEDs show the highest EQE of 6.99% and a NUV 1931 CIEx,y (0.16, 0.04). The photoluminescence quantum yield is measured for the thin film of BB4Ph and 4P-Cz:BB4Ph as 68% and 96%, respectively. Hence, the low limits of light outcoupling efficiency (ηout) of the two individual OLEDs are estimated as 31% and 29%, respectively.
AB - Based on the classic 1,1′:4′,1″-terphenyl fluorophore, a novel near-ultraviolet (NUV) fluorescent BB4Ph (4,4″′-bis(2,3,4,5-tetraphenylphen-1-yl)(1,1′:4′,1″-terphenyl) is designed, synthesized, and characterized. BB4Ph exhibits a NUV fluorescence with a λmax of 373 and 380 nm in solution and as a thin film, respectively. The grazing incidence wide-angle X-ray scattering (GIWAXS) reveals BB4Ph having a high value of order parameter (SGIWAXS) of 0.59 for a molecular layer array normal to the substrate; the angle-dependent photoluminescence (ADPL) measurement shows Θ (horizontal–dipole ratios) as high as 95% with the neat film. The non-doped BB4Ph organic light-emitting diodes (OLEDs) show external quantum efficiency (EQE) up to 5.24% with 1931 Commission Internationale de l’ Eclairage coordinates (CIEx,y) of (0.16, 0.04), a NUV electroluminescence. With 4P-Cz (9,9′-(1,1′:4′,1″:4″,1′″-quaterphenyl-4,4′″-diyl)dicarbazole) as a dopant emitter, doped BB4Ph OLEDs show the highest EQE of 6.99% and a NUV 1931 CIEx,y (0.16, 0.04). The photoluminescence quantum yield is measured for the thin film of BB4Ph and 4P-Cz:BB4Ph as 68% and 96%, respectively. Hence, the low limits of light outcoupling efficiency (ηout) of the two individual OLEDs are estimated as 31% and 29%, respectively.
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U2 - 10.1002/adom.202202666
DO - 10.1002/adom.202202666
M3 - Article
AN - SCOPUS:85148047050
SN - 2195-1071
JO - Advanced Optical Materials
JF - Advanced Optical Materials
ER -