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Investigation of the thermal quenching of two emission centers in Sr9MnLi(PO4)7:Eu2+ using time-resolved technique

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Abstract

The thermal stability of the phosphors in phosphor-converted light-emitting diodes (LEDs) plays an important role in the practical application of lighting. Herein, the Mn2+-based red-emitting phosphors of pure and Eu2+-doped Sr9MnLi(PO4)7 (SMPO) samples were prepared using the high temperature solid-state reaction method. The crystal field environment around the Mn2+ ions was analyzed by combining the results of photoluminescence excitation spectroscopy and Tanabe–Sugano diagrams. By comparing the results of X-ray photoelectron spectroscopy, two additional bands centered at about 129.8 eV and 130.7 eV were found in the Eu2+-doped sample, which corresponded to the chemical states of P 2p3/2 and P 2p1/2. Two different sets of emission spectra were observed for Sr9MnLi(PO4)7:5%Eu2+ (SMPO:Eu2+) on employing the time-resolved technique. The emission peaks centered at 615 nm and 661 nm were attributed to Mn2+ and Eu2+ ions, respectively. The thermal quenching behaviors of Eu2+ and Mn2+ were investigated in the temperature range of 300–620 K and the thermal quenching mechanisms are given in this work. Systematic research on the luminescent properties of Eu2+ and Mn2+ ions in the SMPO:Eu2+ phosphor contributes to the understanding of the thermal stability and aids in the development of Mn2+-based red-emitting phosphors.

Graphical abstract: Investigation of the thermal quenching of two emission centers in Sr9MnLi(PO4)7:Eu2+ using time-resolved technique

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Supplementary files

Article information


Submitted
10 May 2020
Accepted
18 Jun 2020
First published
18 Jun 2020

Phys. Chem. Chem. Phys., 2020, Advance Article
Article type
Paper

Investigation of the thermal quenching of two emission centers in Sr9MnLi(PO4)7:Eu2+ using time-resolved technique

F. Chi, W. Dai, B. Jiang, B. Lou, X. Wei, B. Li, J. Cheng, S. Liu and M. Yin, Phys. Chem. Chem. Phys., 2020, Advance Article , DOI: 10.1039/D0CP02544E

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