Lead-free Mn-based red-emitting hybrid halide (CHN)MnCl toward high performance warm WLEDs

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2021-04, Vol.9 (14), p.4895-492
• Main Authors: Wang, Shiyi, Han, Xinxin, Kou, Tongtong, Zhou, Yayun, Liang, Yi, Wu, Zixuan, Huang, Jialuo, Chang, Tong, Peng, Chengyu, Wei, Qilin, Zou, Bingsuo
• Format: Article
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/d1tc00632k

Environmentally friendly metal hybrid halides show great promise for white light emitting diode (WLED) applications due to their unique optical properties. Herein, a lead-free blue-light excited red-emitting Mn 2+ -based hybrid halide (CH 6 N 3 ) 2 MnCl 4 was obtained via a facile mechanochemical method. (CH 6 N 3 ) 2 MnCl 4 with octahedrally coordinated Mn 2+ ions exhibits intense red emission at 650 nm with a high photoluminescence quantum yield (PLQY) of 55.9% benefiting from its unique crystal structure of ferromagnetic (FM) coupled trimeric [Mn 3 Cl 12 ] 6− linear chains. Besides, (CH 6 N 3 ) 2 MnCl 4 also possesses excellent thermal stability on account of the relatively weak electron-phonon coupling effect. Moreover, the luminescence intensity of (CH 6 N 3 ) 2 MnCl 4 can be significantly improved by 8% Zn 2+ alloying. The WLEDs with different correlated color temperatures (CCT) fabricated using (CH 6 N 3 ) 2 MnCl 4 :8%Zn 2+ and the yellow phosphor Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ) using a blue LED chip exhibit much better overall electroluminescence performance than those based on (CH 6 N 3 ) 2 MnCl 4 . A warm WLED with a CCT of 3984 K, a high luminous efficacy of 90.41 lm W −1 and a color rendering index (CRI) of 93.7 was obtained based on the modified (CH 6 N 3 ) 2 MnCl 4 :8% Zn 2+ halide, indicating its high potential as a red-emitting component for WLED applications. A blue-light excited red-emitting Mn 2+ -based hybrid halide (CH 6 N 3 ) 2 MnCl 4 with a high PLQY of 55.9% was obtained. Using the halide, a high performance warm WLED was fabricated, indicating its potential as a red-emitting component for WLED applications.