Synthesis, characterization and photoluminescence properties of (Gd0.99,Pr0.01)2O2S sub-microphosphor by homogeneous precipitation method
✍ Scribed by Jingbao Lian; Xudong Sun; Ji-Guang Li; Xiaodong Li
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 822 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0925-3467
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✦ Synopsis
Homogeneous precipitation method for synthesizing (Gd 0.99 ,Pr 0.01 ) 2 O 2 S sub-microphosphor was developed, using the commercially available Gd 2 O 3 , Pr 6 O 11 , H 2 SO 4 and (NH 2 ) 2 CO (urea) as the starting materials. It was found that the as-synthesized precursor is mainly composed of (Gd 0.99 ,Pr 0.01 ) 2 (OH) 2 -(CO 3 )(SO 4 )ÁnH 2 O. Pure quasi-spherical shaped (Gd 0.99 ,Pr 0.01 ) 2 O 2 S particles can be synthesized by calcining the precursor at a temperature higher than 700 °C for 1 h in flowing hydrogen. The (Gd 0.99 ,Pr 0.01 ) 2 O 2 S particles have a narrow size distribution with a mean grain size of about 300-400 nm. Photoluminescence spectra of (Gd 0.99 ,Pr 0.01 ) 2 O 2 S under 303 nm UV excitation show a green emission at 515 nm as the most prominent peak, which corresponds to the 3 P 0 ? 3 H 4 transition of Pr 3+ ions. Decay study reveals that the 3 P 0 ? 3 H 4 transition of Pr 3+ ions in Gd 2 O 2 S host lattice has a single exponential decay behavior.