THE INFLUENCE OF RARE-EARTH IMPU-RITIES ON THE LUMINESCENCE OF TERBIUM-ACTIVATED LAN-THANUM OXYSULFIDE
Guo Feng-yu, Jing Xi-ping (Department of Chemistry, Beijing Unicersity)
The influence of ten rare-earth impurities on the luminescent properties of La2O2S:Tb was investigated. Under the excitation of x-ray, cathod ray and UV light, its brightness is quenched by these rare-earth elements, especially Ce, Pr, Eu and Yb. When the concentration cf rare earth is less than 0.1%, the emission sqectra and colour of La2O2S:Tb do not markedly change except Eu and Pr.