High-performance TADF-OLEDs utilizing copper(i) halide complexes containing unsymmetrically substituted thiophenyl triphosphine ligands†

IF 6.1 1区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR
Yu-Ling Liu, Ruiqin Zhu, Li Liu, Xin-Xin Zhong, Fa-Bao Li, Guijiang Zhou and Hai-Mei Qin
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Abstract

Highly efficient OLEDs fabricated with thermally activated delayed fluorescent Cu(I) complexes have attracted significant attention. However, achieving both high quantum efficiency and short decay lifetimes remains a considerable challenge. Herein, we reported the successful synthesis and characterization of two rigid triphosphine ligands, each containing two unsymmetrically substituted thiophenyl rings, and their corresponding mononuclear copper(I) halide complexes, CuX(L1) and CuX(L2) [L1 = (2-PPh2-C4H2S)2(3-PPh), X = I (1), Br (2), Cl (3); L2 = (2-PPh2-5-SiMe3-C4HS)2(3-PPh), X = I (4), Br (5), Cl (6)]. The structures and photophysical properties of these complexes were thoroughly investigated. At room temperature, the powder samples of complexes 1–6 exhibited intense delayed fluorescence, ranging from yellow-green to yellow in color (λem = 553–581 nm, τ = 3.8–9.4 μs, and Φ = 0.19–0.29 for 1–3; λem = 565–589 nm, τ = 2.2–7.6 μs, and Φ = 0.36–0.61 for 4–6). The incorporation of two trimethylsilyl groups into the unsymmetrically substituted thiophenyl rings significantly improved the photoluminescence quantum yield (PLQY) and allowed for fine-tuning of the light-emitting color of the complexes. Among them, complex 4 displayed a high PLQY of 0.61 and a short decay lifetime of 2.2 μs. The radiative decay rate (kr) was 2.8 × 105 s−1, comparable with that of Ir(III) complexes. Vacuum-deposited organic light-emitting devices incorporating complex 4 exhibited yellow emission, achieving a maximum external quantum efficiency (EQE) of 14.57% and a current efficiency of 33.44 cd A−1.

Abstract Image

含不对称取代噻吩基三膦的铜卤化物配合物的高效tadf - oled
热激活延迟荧光Cu(I)配合物制备的高效oled引起了人们的广泛关注。如何实现高量子效率和短衰变寿命仍然是一个挑战。这里,两个刚性三膦配体含有两个不对称取代的噻吩环,和六个单核铜(I)卤化物配合物CuX(L1)和CuX(L2) [L1 = (2- pph2 - c4h2s)2(3- pph), X = I (1), Br (2), Cl (3);成功合成了L2 = (2- pph2 -5- sime3 - c4hs)2(3-PPh), X = I (4), Br (5), Cl(6)],并对其结构和光物理性质进行了表征。在室温下,配合物1 ~ 6表现出强烈的黄绿色到黄色延迟荧光(λem = 553 ~ 581 nm, τ = 3.8 ~ 9.4 μs, Φ = 0.19 ~ 0.29;λem = 565 ~ 589 nm, τ = 2.2 ~ 7.6 μs;Φ = 0.36-0.61(4-6)。在两个不对称取代的噻吩环中引入两个三甲基硅基,显著提高了光致发光量子产率(PLQY),并精细地调节了配合物的发光颜色。其中,配合物4具有0.61的高PLQY和2.2µs的短衰减寿命。辐射衰减率(kr)为2.8 × 105 s−1,与Ir(III)配合物相当。含配合物4的真空沉积有机发光器件发出黄光,最大外量子效率(EQE)为14.57%,电流效率为33.44 cd A−1。
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来源期刊
Inorganic Chemistry Frontiers
Inorganic Chemistry Frontiers CHEMISTRY, INORGANIC & NUCLEAR-
CiteScore
10.40
自引率
7.10%
发文量
587
审稿时长
1.2 months
期刊介绍: The international, high quality journal for interdisciplinary research between inorganic chemistry and related subjects
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