利用顶部籽晶提拉(TSSG)法生长了Yb3+,Tm3+共掺KY(WO4)2晶体,在室温下测量了290～1200 nm内晶体的吸收光谱。根据上转换模型研究了晶体中Yb3+向Tm3+进行能量传递的机制并对晶体中跃迁能级进行了指认,建立了简单的速率方程。计算得出Yb3+离子向Tm3+离子的能量传递效率接近于1。在974 nm激光二极管抽运下观察到Tm3+离子的波长为476 nm蓝色上转换发光。利用Fadenbrug-luechtbauer方法计算了1G4到3H6能级跃迁的发射截面积,其最大发射截面积约为1.51×10-20 cm2。

Thulium and ytterbium codoped KY(WO4)2 crystals were prepared by using top seeded solution growth (TSSG) method. Its absorption spectra were recorded in the region of 290～1200 nm at room temperature. The energy transfer mechanism from Yb3+ to Tm3+ ions was analyzed by using up-conversion model and the transitions of energy levels were assigned. The rate equation of Yb3+ ions to Tm3+ ions energy transition was set up. The efficiency of Yb3+ ions to Tm3+ ions energy transition is close to 1. The up-conversion blue fluorescences at 476 nm were measured when the sample was pumped by 974 nm diode laser. The value of emission cross section for 1G4 to 3H6 transition is estimated with Fadenbrug-luechtbauer method and the peak value is about 1.51×10-20 cm2.