Photon cascade emission of Pr3+ in L

Photon cascade emission of Pr3+ in LnBaB9O16 (Ln = La, Y)

Under 216 nm UV-excitation, cascade emission of Pr3+ occurs from1S0 state in LaBaB9O16:Pr3+ that converts a single UV photon of high energy into two visible photons. The observation of the cascade emission in this oxide matrix is largely due to the weak crystal field on the lanthanum sites. The analysis of the vibrational coupling indicates that the radiative transition from the 3P0 state is related to the low phonon frequency of the BO4 borate groups bonded to the lanthanum atoms (hwmax~850 cm-1). On the other hand, the cascade emission does not take place in a closely related material, YBaB9O16:Pr3+, which can be interpreted by the fact that the 4f5d levels are located below the 1S0 level in this material.

作 者： YANG Zhi Lin Jianhua SU Mianzeng   作者单位： YANG Zhi(State Key Laboratory of Rare Earth Materials Chemistry and Applications, Department of Materials Chemistry, Peking University, Beijing 100871, China;Department of Chemistry, Yunnan Normal University, Kunming 650092, China)

Lin Jianhua,SU Mianzeng(State Key Laboratory of Rare Earth Materials Chemistry and Applications, Department of Materials Chemistry, Peking University, Beijing 100871, China) 

刊 名： 中国科学B辑(英文版)  EI SCI 英文刊名： SCIENCE IN CHINA(SCIENTIA SINICA)  年，卷(期)： 2001 44(1)  分类号： O6  关键词： rare earth borate   photon cascade luminescence   Pr3+