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应用提拉法技术,采用BeO:Al2O3:Ti2O3摩尔比=100:99.85:0.15的化学组分配比,以及选用合适的固液界面温度梯度与生长速度等优化工艺条件,成功地生长出了T3+离子掺杂、无气泡、无云层和核心、尺寸≈Ф60mm×85mm的粉红色Ti3+:BeAl2O4大尺寸晶体。测定了Ti3+:BeAl2O4晶体的激发与荧光光谱。沿着晶体生长方向,晶体的颜色变深。在激发光谱中观测到了502 nm与567nm的激发峰,在发射光谱中观察到了发光中心为710nm的宽带荧光。两激发峰与Ti3+离子的2T2→2E能级跃迁有关,710nm的荧光峰是由振动能级2E→2T2产生的。从不同部位晶体的吸收强度和颜色变化可得到Ti3+离子在BeAl2O4晶体中的有效分凝系数小于1。
By using the Czochralski method, the chemical composition ratio of BeO: Al2O3: Ti2O3 = 100: 99.85: 0.15 and the optimal process conditions such as the temperature gradient and the growth rate of solid-liquid interface were chosen to successfully grow T3 + ions Doping, bubble-free, cloudless and core, pink Ti3 +: BeAl2O4 large size crystal with dimensions ≈Ф60mm × 85mm. The excitation and fluorescence spectra of Ti3 +: BeAl2O4 crystals were measured. Along the crystal growth direction, the color of the crystal becomes darker. Excitation spectra were observed in 502 nm and 567 nm excitation peak was observed in the emission spectrum of the center of 710 nm broadband fluorescence. The two excitation peaks are related to the 2T2 → 2E level transitions of Ti3 + ions. The fluorescence peak at 710 nm is generated by the vibrational level 2E → 2T2. The effective segregation coefficient of Ti3 + ions in BeAl2O4 crystal is less than 1 from the absorption intensity and color change of crystals in different parts.