Journal
CHEMICAL SCIENCE
Volume 11, Issue 9, Pages 2342-2349Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9sc05492h
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Funding
- National Natural Science Foundation of China [51873176, 21901190]
- Science and Technology Projects of Jiangmen [(2018) 352, (2017) 307, (2017) 149]
- Cooperative Education Platform of Guangdong Province [(2016) 31]
- Key Laboratory of Optoelectronic Materials and Applications in Guangdong Higher Education [2017KSYS011]
- Hong Kong Research Grants Council [C6009-17G, PolyU 153051/17P]
- Areas of Excellence Scheme of the University Grants Committee, HKSAR [AoE/P-03/08]
- Hong Kong Polytechnic University [1-ZE1C]
- [8475S]
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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.
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