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.
出处
《光学学报》
EI
CAS
CSCD
北大核心
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)
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
materials Pb Se quantum dot doped glass two-step melting-heat treatment absorption spectrum photoluminescence spectrum fiber material
