InBO_3∶Tb^(3+)荧光粉的合成及其发光性质

Synthesis and luminescent properties of InBO_3∶Tb^(3+) phosphor

硼酸盐体系绿色荧光粉具有发光效率高、光色纯、烧结温度低、合成简便、粒径适中等优点,广泛用于等离子彩色电视机。应用高温固相反应法合成In0.98Tb0.02BO3荧光粉,并研究其中Tb3+的光谱性质及能量传递现象。发现激发光谱中Tb3+在274nm处有一最强4f→5d激发峰,能有效地吸收能量。发射光谱在550nm处有一最强峰,属于Tb3+的5D4→7F的跃迁,发绿光。发射峰高而窄,说明荧光粉In0.98Tb0.02BO3发光强度高,且只有一个峰,说明发光颜色纯,有一定的开发价值。还研究了几种因素对In0.98Tb0.02BO3荧光粉相对亮度的影响并得出了合成In0.98Tb0.02BO3荧光粉的最佳实验条件:焙烧温度1300℃,焙烧时间4h。

For many years,the borate luminescence materials have been paid much attention owing to their properties of low preparation temperature and high luminescent efficiency.In order to search for the new green-photoluminescence material, In0.98Tb0.02BO3 was synthesized by high temperature solid state reaction at a weak reductive atmosphere which was made by the active carbon powder.The optimum preparation condition of indium borate terbium is 1 300 ℃ of calcination temperature and 4 h of calcinations time.The excitation spectra and emission spectra are measured by F-2500 flurospectrophotometer. Indium borate terbium emits 550 nm of green light when excited by 274 nm of ultraviolet and its peak is high and narrow, which shows that the color of the luminophor is pure and it has certain value.