稀土学报(英文版)
稀土學報(英文版)
희토학보(영문판)
JOURNAL OF RARE EARTHS
2014年
8期
691-695
,共5页
刘畅%张壁%郝绿原%徐鑫
劉暢%張壁%郝綠原%徐鑫
류창%장벽%학록원%서흠
Sr2Si5N8:Eu2+%phosphor%direct silicon nitridation%photoluminescence%rare earths
Highly efficient Sr2Si5N8:Eu2+red emitting phosphor was successfully synthesized by a cost-effective direct silicon nitrida-tion and gas-reduction method. The effects of synthesis parameters, including reaction temperature, heating rate and gas species, on the crystal structure and photoluminescence of the prepared phosphors were studied. Single-phase Sr2Si5N8:Eu2+phosphor was ob-tained at 1500 oC with a heating rate of 300 oC/h under NH3-1 vol.%CH4 atmosphere using starting silicon and oxide powders. Silicon powder and high heating rate favored the achievement of the pure Sr2Si5N8 phase. Under near-UV to blue light excitation, the obtained Sr2Si5N8:Eu2+phosphor showed a board red emission band centered at about 625 nm, which agreed well with the phosphors prepared by the conventional solid-state reaction. The possible reaction mechanism was also proposed based on the experimental observations.