熔融二次热处理优化制备近红外钠硼铝硅酸盐PbSe量子点荧光玻璃  

Near-Infrared PbSe Quantum Dots-Doped Sodium-Aluminum-Borosilicate Silicate Glass Prepared Optimally by Melting Method of Two-Step Heat Treatment

作　　者：程成[1] 黄吉[1] 徐军[1] 

机构地区：[1]浙江工业大学光电子智能化技术研究所,浙江杭州310023

出　　处：《光学学报》2015年第5期272-278,共7页Acta Optica Sinica

基　　金：国家自然科学基金(60777023;61274124)

摘　　要：采用高温熔融法,经过两步退火热处理,在钠硼铝硅酸盐玻璃基底中成功合成了晶粒尺寸为3.63~4.33 nm、掺杂体积分数为2%的Pb Se量子点。用高温差热分析仪确定了最佳的热处理温度,用X射线衍射仪和透射电镜分析了玻璃中Pb Se量子点的结晶、尺寸和粒子分布情况。用分光光度仪和荧光光谱仪,观测了量子点玻璃的吸收谱和荧光发射谱。结果表明,第一次热处理时间在3~5 h之间,温度为500°C,玻璃才有荧光辐射,其辐射峰的半峰全宽为200 nm,峰值波长位于1220~1279 nm。第二次热处理的最佳时间为10 h,温度为540°C。给出了量子点尺寸关于第一次热处理时间的经验公式。提供的制备Pb Se量子点玻璃的方法和工艺数据,将为量子点玻璃拉制成光纤,制成高增益或宽带宽的新型光纤提供依据。Pb Se quantum dots（QDs） in the sodium-aluminum-borosilicate silicate glass are successfully prepared by using a melting method of two-step heat treatment. The size of obtained QDs distributes within3.63~4.33 nm and with the doped volume ratio of 2% in the glass. The optimal heat treatment temperature is determined by using a differential thermal analysis. The crystallization, particle size and distribution of the QDs in the glass are observed by X-ray diffractometer and transmission electron microscopy. The absorption and photoluminescence（PL） spectra of the QDs are also measured by ultraviolet（UV）-visible-near infrared（NIR）spectrophotometer and fluorescence spectrometer, respectively. There is evidence to show that only when the first heat-treatment time is between 3~5 h and the temperature is 500 °C, the glass has PL emission, ranging in1220~1279 nm and with full width at half maximum（FWHM） of 200 nm. For the second heat treatment, the optimal time and temperature are 10 h and 540 °C, respectively. An empirical formula is given for the Pb Se QD size depending on the first heat treatment time. The method of Pb Se QD doped glass can help to form QD doped fiber devices with high gain in the future.

关 键 词：材料 PbSe量子点玻璃 熔融法两步退火热处理 吸收谱 光致发光谱 光纤材料 

分 类 号：TN213[电子电信—物理电子学]