Citation: LIU Man-Man, GENG Ai-Fang, YAN Jing-Hui, LIAN Hong-Zhou. Soft-Chemical Preparation and Performance of Red Phosphor Cs₂SiF₆: Mn⁴⁺ for White LEDs[J]. Chinese Journal of Inorganic Chemistry, ;2019, 35(9): 1593-1601. doi: 10.11862/CJIC.2019.179 shu

Soft-Chemical Preparation and Performance of Red Phosphor Cs₂SiF₆: Mn⁴⁺ for White LEDs

1.
School of Chemical and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, China
2.
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry Chinese Academy of Sciences, Changchun 130022, China

Corresponding author: GENG Ai-Fang, gengaifang0687@sina.com YAN Jing-Hui, yjh@cust.edu.cn
Received Date: 19 April 2019
Revised Date: 16 May 2019

Figures(9)

Cs₂SiF₆:Mn⁴⁺ red phosphor was synthesized by a soft chemistry method. The phase and morphology of the samples were characterized by powder X-ray diffraction (XRD) and scanning electron microscopy(SEM). The fluorescence spectra with different Mn⁴⁺ doping concentrations, temperature-dependence emission spectra, lumine-scence lifetime and quantum efficiency of the samples were measured to evaluate their performance. At the same time, the LED devices were encapsulated and the photoelectric performance was tested. The results reveal that the as-synthesized pure phase red phosphor Cs₂SiF₆:Mn⁴⁺ has an irregular morphology. In the excitation spectra, the broadband excitation peaks at 360 and 460 nm are attributed to ⁴A_2g→⁴T_1g and ⁴A_2g→⁴T_2g transitions, respectively. In the emission spectra, the narrow-band emission peak at 630 nm can be attributed to ²E_g→⁴A_2g transition. When the temperature rose from 25 to 150℃, the luminescence intensity remained basically unchanged. The luminescence intensity at 150℃ was 100.03% of that at 25℃. The luminescence life of samples with different Mn⁴⁺ doping concentrations are above 8.0 ms. The quantum efficiency of the optimal sample Cs₂SiF₆:0.06Mn⁴⁺ is 88%. In addition, in the devices encapsulated by using Cs₂SiF₆:0.06Mn⁴⁺ as the red component, when the addition amount of Cs₂SiF₆:0.06Mn⁴⁺ is 24% (mass fraction), the CIE coordinate is (0.411 3, 0.412 9), color temperature CCT=3 899 K, color rendering index Ra=88, R9=84.2, and the luminous efficiency is 123.84 lm·W^-1. Meanwhile, the devices emit warm white light.
- soft chemistry method,
- red phosphors,
- optical performance,
- warm white light
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Soft-Chemical Preparation and Performance of Red Phosphor Cs2SiF6: Mn4+ for White LEDs

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通讯作者: 陈斌, bchen63@163.com

Soft-Chemical Preparation and Performance of Red Phosphor Cs₂SiF₆: Mn⁴⁺ for White LEDs