痕量双掺Sm^(3+)和Gd^(3+)对Y_2O_2S∶Eu^(3+)发光特性的影响

Effects of Doping Trace Sm^(3+) and Gd^(3+) on Luminescent Character of Y_2O_2S∶Eu^(3+)

通过对Y2O2S∶Eu3+红色荧光粉痕量引入Sm3+和Gd3+的研究,发现可有效地增强发光强度,明显改善其电压特性(发射强度与激发电压间的关系特性),且不影响材料的其他物理化学性能。讨论和分析了发射强度增强、电压特性改善的原因:Gd3+对Y3+的置换,减少了因Eu3+对Y3+置换所引起的晶格的畸变、缺陷,使Eu3+离子晶场环境得到改善,从而减弱了无辐射过程及因晶格畸变所造成的能量损失;Sm3+的发射与Eu3+的吸收(激发)的部分重叠,且Eu3+激发光谱中包含有Sm3+激发跃迁谱线,导致了Sm3+→Eu3+共振能量传递可能性,有效地实现Sm3+对Eu3+的敏化效应。

After trace Sm^(3+) ions and Gd^(3+) ions doping, the emission intensity of red phosphors Y_2O_2S∶Eu^(3+) was enhanced and the voltage character (relation between emission intensity and excitation voltage) was improved while the other properties of physics and chemistry were not changed. The origins of enhancement and improvement are discussed. Probably the distortion and the defect of crystals are decreased by the substitution of Gd^(3+) for Y^(3+) instead of Eu^(3+) for Y^(3+), and thus the Eu^(3+) crysta...