Gd2O3:Eu phosphor particles with red emission were directly prepared by a continuous spray pyrolysis process. Photoluminescence, morphology and crystallinity of the as-prepared and annealed particles were investigated. The particles prepared at 800 °C have sharp peaks of cubic phase Gd2O3, and the crystallinity of the cubic phase increased with increasing reactor temperature up to 1400 °C. The mean size of the particles increased from 0.35 to 1.2 μm when the solution concentration was increased from 0.02 to 1 M. The Gd2O3:Eu particles absorbed excitation energy in the range from 220 nm to 300 nm, and the maximum excitation wavelength was near 255 nm. The optimum brightness was obtained at a doping concentration of 10 at.%. The main emission peak was 612 nm, resulting in a red emission. The red light was obtained at 600 °C when the prepared particles were excited by UV light. The maximum PL intensity was obtained at 1400 °C, and the pattern of the PL spectra of the particles was changed at 1600 °C. The PL intensity of the as-prepared particles at 1400 °C was increased by a factor of 1.1 in comparison with annealed particles.
Bibliographical noteFunding Information:
One of us (YCK) thanks the KOSEF (Korean Science and Engineering Foundation) for a postdoctoral fellowship at Hiroshima University where this study was performed. Support from the Ministry Education, Culture, Science of Japan (Grant No. 10650745) and the Hiroshima Industrial Technology Organization are gratefully acknowledged.
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics