Structure and photoluminescence of Eu3+ doped Sr2InTaO6 red phosphor with high color purity. Issue 14 (22nd February 2021)

• Record Type: Journal Article
• Authors: Zhao, Jingfen; Gao, Hui; Xu, Hui; Zhao, Zhiwei; Bu, Hongxia; Cao, Xuefei; He, Lining; Yang, Zaifa; Sun, Jiayue
• Is Part Of: RSC advances. Volume 11:Issue 14(2021)
• Page Start: 8282
• Page End: 8289
• Publication Date: 2021-02-22
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra00165e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Novel red emitting double perovskite Sr2 InTaO6 phosphors with high color purity were prepared and developed for white light-emitting diodes. Abstract : The Eu 3+ -doped Sr2 InTaO6 phosphors were obtained by solid-state reaction method and the phase purity of Sr2 InTaO6 :Eu 3+ samples were investigated by the XRD patterns. The Rietveld refinements were conducted to further obtain crystal structure information and the results indicate Sr2 InTaO6 :Eu 3+ samples crystallized in the monoclinic system with a P 121 space group. The optical band gap of Sr2 InTaO6 was calculated to be 3.84 eV by the diffuse reflectance spectra, which are consistent with the result (3.823 eV) of density functional theory. Under 396 nm excitation, the Sr2 InTaO6 :Eu 3+ phosphor showed a red photoluminescence band centered at about 624 nm due to the 5 D0 → 7 F2 transition. Monitored at 624 nm, the phosphors showed two wide bands from 200 nm to 500 nm, which originated from the charge-transfer band of Eu 3+ –O 2− and f–f transitions of Eu 3+ ions. The optimum luminous concentration is 0.12 because of the concentration quenching determined to be a quadrupole–quadrupole interaction. The luminescence decay lifetimes of the Sr2 InTaO6 :Eu 3+ phosphors were milliseconds. Significantly, the temperature-dependent emission spectra of Sr2 InTaO6 :0.12Eu 3+ phosphors exhibited good thermal stability and the CIE chromaticity coordinates of Sr2 InTaO6 :0.12Eu 3+ were (0.6265, 0.3693) with high color purity. The present work demonstrated that the Sr2 InTaO6 :Eu 3+ red-emitting phosphors show great application in lighting technology.