PbSe量子点硅酸盐玻璃光纤的制备及光纤光致荧光光谱特性

对钠硼铝硅酸盐玻璃熔体进行拉丝,再经过退火热处理,制备得到光纤直径80~130μm的PbSe量子点玻璃裸光纤.透射电镜分析发现光纤中PbSe量子点的晶粒尺寸为4.2~5.5nm,掺杂体积比约1%.对量子点光纤的柔性进行了初步测试.以980nm泵浦激光作为激励源,用荧光光谱仪观测了量子点光纤的荧光发射谱.结果表明:合适的量子点光纤的退火条件跟块玻璃不同.当退火温度为500~600℃、热处理时间为5~10h时,观测到量子点光纤有强烈的荧光辐射,峰值波长位于1 300~1 450nm,半高全宽达200~330nm.光纤最佳退火温度为600℃、时间7.5h.本文得到的量子点玻璃光纤可进一步制备成玻璃基底的量子点光纤型增益器件光纤放大器、光纤激光器等.

Preparation of PbSe-Quantum-Dot-Doped-Silicate Glass Fiber and the Fiber Photoluminescence Spectrum

PbSe quantum dot doped bare-optical fibers are prepared in laboratory by drawing sodium-aluminum-borosilicate-silicate-glass fusant and annealing heat treatment.The fibers are in the diameter of 80~130 μm.Transmission-electron microscope measurement shows that the prepared PbSe quantum dot in the fibers are in the diameter of 4.2~5.5 nm and with the doped volume ratio of 1%.The flexibility of Pbse quantum dot doped fibers is tested initially.The photoluminescence spectra of fibers are measured upon 980-nm pump by a fluorescence spectrometer.There is evidence to show that the available annealing condition of PbSe quantum dot fibers is different from PbSe quantum dot doped-bulk glass.When the annealing temperature is within 500~600 ℃ and the annealing time spans 5~10 h, the PbSe quantum dot fiber shows strongest photoluminescence emission, peaking wavelength ranging 1 300~1 450 nm and full width at half maximum coming to 200~330 nm.The optimum annealing temperature and time are 600 ℃ and 7.5 h, respectively.The PbSe quantum dot fibers obtained in this paper can be used to format PbSe-quantum-dot-doped-fiber gain devices based on glass (such as fiber amplifiers and fiber lasers) in the future.