Journal
OPTICAL MATERIALS
Volume 88, Issue -, Pages 392-395Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2018.11.056
Keywords
Judd-Ofelt; Europium; HfO2:Eu3+; CIE; LED; Phosphor
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Funding
- Ministry of Education, Science, and Technological Development of the Republic of Serbia [171035, 45020]
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Judd-Ofelt analysis of HfO2:Eu3+ with various europium doping concentrations, formed by plasma electrolytic oxidation, had been investigated. Omega(2) parameter is increasing, while Omega(4) parameter shows no concentration dependence. For the highest europium doping concentration of 0.62 at% Omega(2) = 4.03.10(-20) cm(2) and Omega(4) = 2.26.10(-20) cm(2). Radiative transition probabilities of each allowed emitting level were calculated. The radiative lifetime of D-5(0) emitting level and a relatively high cross section of emission D-5(0) -> F-7(2) were estimated: 1.58 ms and 13.49.10(-22) cm(2), respectively. CIELUV coordinates of photoluminescence of HfO2 doped with various europium concentrations and by excitation with UV 270 nm and 395 nm beam had been calculated and plotted to the CIE 1976 diagram. For low concentrations HfO2:Eu3+ and UV excitation the material gives almost pure white luminescence, which is an indication for its potential use as a white LED phosphor.
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