Abstract
The solution precipitation is used to synthesize the Tb doped yttrium phosphates. The as-synthesized is the monoclinic phased YPO 4·2H2O with churchite-type structure, which is transformed to the tetragonal phased YPO4 with xenotime-rype structure as the temperature approaches 200°C during the thermal treatment process. This phase transformation process can not be observed in some routes that need a higher synthetic temperature, in which, only a high-temperature phase is obtained. The luminescent efficiency dependence on the heat-treatment temperature is investigated. The luminescent efficiency presents a two-step increase respectively around 300 and 700°C. Results indicate that the significant increase of luminescent efficiency at 300°C is not related to the phase structure transformation, but to the decrease of OH- ions content, and that the significant increase of luminescent efficiency at 700°C is related to the increase of crystallinity, which may increase the absorption to VUV light.
Original language | English |
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Article number | 60300M |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 6030 |
DOIs | |
State | Published - 2006 |
Event | ICO20: Display Devices and Systems - Changchun, China Duration: Aug 21 2005 → Aug 26 2005 |
Keywords
- Luminescence
- Oh group
- Plasma display panel
- Structure transformation
- Tb
- Vacuum ultraviolet