Color-Tunable Organic Light-Emitting Diodes with Single Pt (O^N^C^N)-Dibenzofuran Emitter Exhibiting High External Quantum Efficiency of ≈30% and Superior Operational Lifetime

Mao，Mao1,2; Li，Huiyang1; Lo，Kar Wai1; Zhang，Dongdong3; Duan，Lian3; Xu，Shuo1; Wan，Qingyun1; Tan，Kaixin1; An，Pengcheng4; Cheng，Gang1,2,5; Che，Chi Ming1,2,5

2024-06-20

10.1002/adma.202311020

Advanced Materials   影响因子和分区

0935-9648

1521-4095

Color-tunable organic light-emitting diodes (CT-OLEDs) have a large color-tuning range, high efficiency and operational stability at practical luminance, making them ideal for human-machine interactive terminals of wearable biomedical devices. However, the device operational lifetime of CT-OLEDs is currently far from reaching practical requirements. To address this problem, a tetradentate Pt(II) complex named tetra-Pt-dbf, which can emit efficiently in both monomer and aggregation states, is designed. This emitter has high T of 508 °C and large intermolecular bonding energy of -52.0 kcal mol⁻, which improve its thermal/chemical stability. This unique single-emitter CT-OLED essentially avoids the “color-aging issue” and achieves a large color-tuning span (red to yellowish green) and a high external quantum efficiency （EQE） of ≈30% at 1000 cd m as well as an EQE of above 25% at 10000 cd m. A superior LT operational lifetime of 520,536 h at a functional luminance of 100 cd m, which is over 20 times longer than the state-of-the-art CT-OLEDs, is estimated. To demonstrate the potential application of such OLEDs in wearable biomedical devices, a simple electromyography (EMG)-visualization system is fabricated using the CT-OLEDs.

color-tunable device lifetime OLED platinum complex wearable biomedical device

SCI ; EI

英语

其他

MATERIALS SCIENCE

2-s2.0-85188922192

Scopus

1.State Key Laboratory of Synthetic Chemistry,Department of Chemistry,The University of Hong Kong,Pokfulam Road,Hong Kong
2.HKU Shenzhen Institute of Research and Innovation,Shenzhen,Guangdong,518053,China
3.Key lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education,Department of Chemistry,Tsinghua University,Beijing,100084,China
4.School of Design,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
5.Hong Kong Quantum AI Lab Limited,Unit 909-915 of 17W Building, Science Park, NT,Hong Kong

Mao，Mao,Li，Huiyang,Lo，Kar Wai,et al. Color-Tunable Organic Light-Emitting Diodes with Single Pt (O^N^C^N)-Dibenzofuran Emitter Exhibiting High External Quantum Efficiency of ≈30% and Superior Operational Lifetime[J]. Advanced Materials,2024,36(25).

Mao，Mao.,Li，Huiyang.,Lo，Kar Wai.,Zhang，Dongdong.,Duan，Lian.,...&Che，Chi Ming.(2024).Color-Tunable Organic Light-Emitting Diodes with Single Pt (O^N^C^N)-Dibenzofuran Emitter Exhibiting High External Quantum Efficiency of ≈30% and Superior Operational Lifetime.Advanced Materials,36(25).

Mao，Mao,et al."Color-Tunable Organic Light-Emitting Diodes with Single Pt (O^N^C^N)-Dibenzofuran Emitter Exhibiting High External Quantum Efficiency of ≈30% and Superior Operational Lifetime".Advanced Materials 36.25(2024).