A simple and efficient approach toward deep-red to near-infrared-emitting iridium(III) complexes for organic light-emitting diodes with external quantum efficiencies of over 10%

Chen, Zhao1; Zhang, Hongyang2,3; Wen, Dawei1; Wu, Wenhai1; Zeng, Qingguang1; Chen, Shuming4; Wong, Wai-Yeung2,3

2020-03-07

10.1039/c9sc05492h

Chemical Science   影响因子和分区

2041-6520

2041-6539

While the external quantum efficiency (EQE) of iridium(III) (Ir(III)) phosphor based near-infrared organic light-emitting diodes (NIR OLEDs) has been limited to 5.7% to date, there is no significant EQE improvement for these types of OLEDs due to the lack of efficient Ir(III) emitters. Here, a convenient approach within three synthetic steps is developed to afford two novel and efficient deep-red to near-infrared (DR-NIR) emitting phosphors (CNIr and TCNIr), in which a cyano group is added into a commercial red emitter named Ir(piq)(2)(acac) to significantly stabilize the lowest unoccupied molecular orbitals of the newly designed Ir(III) complexes. They emit strong DR-NIR phosphorescence emissions at a wavelength of around 700 nm, with relatively high absolute quantum efficiencies of around 45% for their doped films. DR-NIR OLEDs made using CNIr and TCNIr exhibit high-efficiencies, affording peak EQEs of 10.62% and 9.59% with emission peak wavelengths of 690 and 706 nm, respectively. All these devices represent the most efficient Ir(III)-based DR-NIR OLEDs with a similar color gamut. The simplified synthesis procedure of the DR-NIR-emitting phosphors in conjunction with their excellent performance in OLEDs confirms our efficient strategy to achieve the DR-NIR-emitting Ir(III) phosphors.

EI ; IC ; SCI

英语

NI期刊 ; NI论文

通讯

[8475S]

Chemistry

Chemistry, Multidisciplinary

WOS:000519240000032

ROYAL SOC CHEMISTRY

20201208306763

Efficiency ; Infrared devices ; Light emission ; Molecular orbitals ; Organic light emitting diodes (OLED) ; Phosphors ; Quantum efficiency

Semiconductor Devices and Integrated Circuits:714.2 ; Light/Optics:741.1 ; Production Engineering:913.1 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4

EV Compendex

1.Wuyi Univ, Sch Appl Phys & Mat, Jiangmen 529020, Peoples R China
2.Hong Kong Polytech Univ PolyU, Dept Appl Biol & Chem Technol, Hung Hom, Hong Kong, Peoples R China
3.PolyU Shenzhen Res Inst, Shenzhen 518057, Peoples R China
4.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China

Chen, Zhao,Zhang, Hongyang,Wen, Dawei,et al. A simple and efficient approach toward deep-red to near-infrared-emitting iridium(III) complexes for organic light-emitting diodes with external quantum efficiencies of over 10%[J]. Chemical Science,2020,11(9):2342-2349.

Chen, Zhao.,Zhang, Hongyang.,Wen, Dawei.,Wu, Wenhai.,Zeng, Qingguang.,...&Wong, Wai-Yeung.(2020).A simple and efficient approach toward deep-red to near-infrared-emitting iridium(III) complexes for organic light-emitting diodes with external quantum efficiencies of over 10%.Chemical Science,11(9),2342-2349.

Chen, Zhao,et al."A simple and efficient approach toward deep-red to near-infrared-emitting iridium(III) complexes for organic light-emitting diodes with external quantum efficiencies of over 10%".Chemical Science 11.9(2020):2342-2349.