Enhanced orange-red emission from KSrVO4:Sm3+ nanophosphor for possible application in blue light-emitting diode based white LED. (10th February 2015)

• Record Type: Journal Article
• Authors: Biswas, P; Kumar, Vinay; Ntwaeaborwa, O M; Swart, H C
• Is Part Of: Materials research express. Volume 2:Number 2(2015)
• Publication Date: 2015-02-10
• Subjects: nanophosphors -- luminescence -- wLED -- orthovanadates; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/2/2/025010
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: In this paper, the combustion synthesis and photoluminescence properties of Sm 3+ doped KSrVO4 nanophosphors are reported. The samples were characterized by different techniques such as x-ray powder diffraction, transmission electron microscopy, UV–vis spectrophotometry and photoluminescence spectroscopy. The lattice parameters were calculated as and Ǻ 3 . The average grain size of the samples was estimated as 42 nm using the modified Scherrer's equation. Under near UV excitation, the sharp emission line at 560, 600, 646 and 704 nm due to characteristic transitions of Sm 3+ were observed. The maximum PL emission intensity was observed at 1.5 mol.% of the Sm 3+ ions. The band gap of the phosphor was calculated from diffused reflectance data and was found to be 3.74 eV. The CIE 1931 chromaticity coordinates (x, y) of the phosphor were (0.61, 0.39), in a shade of orange-red color. The potential applications of this material as a down conversion phosphor under blue light excitation were evaluated for possible application as a high color-purity phosphor in light emitting diodes (LEDs) that can fill the 590–600 nm gap.