Yb^(3+)/Er^(3+)共掺碲钨酸盐玻璃的能量传递与频率上转换发光

ENERGY TRANSFER AND FREQUENCY UPCONVERSION LUMINESCENCE OF Yb^3+ /Er^3+ CO-DOPED TUNGSTEN - TELLURITE GLASSES

在970nm LD激发和Er^(3+)离子浓度几乎不变情况下,研究了Yb^(3+)/Er^(3+)共掺碲钨酸盐玻璃中的能量传递和其上转换发光特性。结果表明:随掺Yb^(3+)浓度的增加,Yb^(3+)件/Er^(3+)间能量传递效率也增加,其值在0.52到0.60之间。在Yb^(3+)/Er^(3+)共掺碲钨酸盐玻璃中观察到峰值分别位于533,547nm和668nm的上转换绿光和红光,它们分别来源于Er^(3+)离子2~H_(11/2)→~I_(15/2)(533 nm),~S_(3/2)&→~4I_(15/2)(547 nm)和~4F_(9/2→~4I_(15/2)(668 nm)辐射跃迁。上转换红光和绿光均为双光子过程,且随Yb^(3+)离子掺杂浓度的增加,上转换红绿光强度和其强度比值I_r/I_g也增加,这被认为是与激发态Er^(3+)与激发态Yb^(3+)之间的能量传递过程有关。

The energy transfer and infrared to visible frequency upconversion emission for Yb3+ /Er3+ co-doped tungsten - tellu-rite glasses were experimentally investigated under the conditions of excited at 970 nm and doped with almost the same content of Er3+ ions. With the increase of Yb3+ content, the energy transfer effjciency from Yb3+ to Er3+ increases gradually and the values of efficiency are all between 0. 52 - 0. 60. Three visible emission bands are observed in Yb3+/Er3+ co-doped tungsten -tellurite glasses excited by 970 nm LD. The three peak values of upconversion emission are located at 533, 547 nm and 668 nm, re-spectively. The red emission originates from 4F9/2→4I15/2 (668 nm) radiative transition, and the two green emissions originate from 4S3/2→4I15/2 (547 nm) and 2H11/2→4I15/2 (533 nm) radiative transitions. The red emission and green emission are a two-pho-non process. The rnore Yb3+ ions in glass, the stronger the green emission intensity and the red emission intensity are, and the larger the ratio of red emission intensity to green emission intensity is. This could be attributed to the courses of energy transfer between the excited state Er3+ ions and the excited state Yb3+ ions.