In:
Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 727 ( 2017-1), p. 604-611
Abstract:
Sc 0.88-x Lu 0.05 VO 4 :Eu 3+ 0.07 ,Bi 3+ x (0≤x≤0.05) red phosphors were synthesized by solid state reaction at 1200°C for 3h. The structure, morphology and luminescence spectra of samples are investigated by X-ray diffraction (XRD), Scanning electron microscope (SEM) and fluorescence spectrophotometer, respectively. The samples doped with Eu 3+ , Lu 3+ and Bi 3+ maintain the body-centered tetragonal structure of ScVO 4 and the morphology remains essentially unchanged with slight agglomeration. The excitation spectrum of Sc 0.88-x Lu 0.05 VO 4 :Eu 3+ 0.07 ,Bi 3+ x emerged redshift and the excitation intensity increase within the near UV excitation (360-400nm). The optimum doping concentration of Bi 3+ is 0.02(x value), and the maximum emission intensity of Sc 0.86 Lu 0.05 VO 4 :Eu 3+ 0.07 ,Bi 3+ 0.02 is higher than 88 % in comparison with Sc 0.88 Lu 0.05 VO 4 :Eu 3+ 0.07 under 365 nm excitation. Decay curve of 5 D 0 state for as-prepared samples fits the single order exponential behavior, the lifetime of 5 D 0 increase first and then decrease with the increase of Bi 3+ doping concentration. The internal quantum efficiency is up to 74.08% under 365nm excitation; When the temperature raises to 200°C, the emission intensity maintains 79% of that in the room temperature. Sc 0.86 Lu 0.05 VO 4 :Eu 3+ 0.07 ,Bi 3+ 0.02 phosphor show high internal quantum efficiency and thermal stability, which is suitable for the UV-pumped white LED as red phosphor.
Type of Medium:
Online Resource
ISSN:
1662-9795
DOI:
10.4028/www.scientific.net/KEM.727
DOI:
10.4028/www.scientific.net/KEM.727.604
Language:
Unknown
Publisher:
Trans Tech Publications, Ltd.
Publication Date:
2017
detail.hit.zdb_id:
2073306-9
Permalink