K₂MnF₆/KHF₂ red phosphor synthesis by a low temperature way for high color rendering index white light emitting diodes

Abstract

A series of K₂MnF₆/KHF₂ red phosphors were prepared through a low temperature way and their morphology and photoluminescence (PL) properties were investigated. The as-prepared phosphor shows an intense red emission with the strongest emission peak at 631 nm under a 454 nm excitation. Furthermore, the PL intensity and thermal stability performance, together with the quantum yields of the entitled phosphors excited under blue light are investigated and compared with relative commercial used phosphors. Finally, a bright LED with high color rendering performance of Ra = 86.8 was fabricated by using a 450 nm blue chip with YAG:Ce³⁺ and the as-prepared K₂MnF₆/KHF₂ phosphor. The results indicate that the K₂MnF₆/KHF₂ phosphors could facilitate potential application in the field of indoor lighting and backlighting.

Keywords:

• Low temperature synthesis
• K₂MnF₆/KHF₂
• red phosphor
• WLEDs

Acknowledgement

This work is financially supported by the National Natural Science Foundation of China (NSFC) (51672177), Program of Shanghai Academic/Technology Research Leader (19XD1434700), the program for teacher development project (CXYSIT17002) of Shanghai Municipal Education Commission, young scientist’s development fund (ZQ2018-27) at Shanghai Institute of Technology, the opening fund of Key Laboratory of High Performance Fibers & Products of Ministry of Education at Donghua University.