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Characterization and luminescence properties of ZnAl2O4:Tb3+ (2.5%) phosphor

I. MIRON1,2, C. ENACHE3, A. DABICI2, I. GROZESCU1,2,*

Affiliation

  1. ”Politehnica” University of Timisoara, 300006, Timisoara, Romania
  2. National Institute for Research and Development in Electrochemistry and Condensed Matter Timisoara, 300569, Romania
  3. Institute of Chemistry Timisoara of Romanian Academy, 300223, Timisoara, Romania

Abstract

ZnAl2O4:Tb3+ (2.5%) phosphor was synthesized by coprecipitation method and then annealed at 1000ºC for 3h. The sample was investigated by means of X-ray diffraction to analyze the crystal structure. It was found that a single spinel phase is present and the average crystallite size was found to be around 32 nm. Atomic force microscopy measurements confirmed the nano-size of the particles. The purity of the sample was confirmed, also, by EDX and FT-IR analysis. Optical properties of Tb (2.5%) doped ZnAl2O4 phosphor was analyzed by means of UV/VIS/NIR and photoluminescence (PL) analysis. The band gap of the sample was found to be 4.27 eV. The excitation spectrum showed a broad band centered at 234 nm which correspond to 4f-5d transition and some sharp lines beyond 300 nm which correspond to f-f transitions. The emission spectrum presented an intense peak centered at 545 nm which correspond to the 5D4 → 7F5 transition. Also, peaks corresponding to 5D4 → 7F4 (586 nm) and 5D4 → 7F3 (624 nm) transitions were found. The emission colour of terbium doped ZnAl2O4 was found to be green..

Keywords

Zinc Aluminate, Phosphors, Terbium, Luminescence.

Submitted at: June 18, 2012
Accepted at: Sept. 20, 2012

Citation

I. MIRON, C. ENACHE, A. DABICI, I. GROZESCU, Characterization and luminescence properties of ZnAl2O4:Tb3+ (2.5%) phosphor, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 9-10, pp. 820-825 (2012)