硒化锌微米晶的制备、形貌及光致发光性能研究

本文利用硝酸锌作为锌源、硒粉作为硒源,采用水热法在不添加任何表面活性剂的情况下制备了ZnSe微米晶.利用差热(TG-DTA)分析仪、X射线衍射仪(XRD)、扫描电子显微镜(SEM)和光致发光谱(PL)对产物进行热稳定性、结构、形貌和光学性能表征.差热结果表明ZnSe微米晶在常温下具有一定的稳定性,在500至600℃之间存在一个很强的放热峰.XRD和SEM研究结果表明,ZnSe微米晶具有闪锌矿结构并且其尺寸大约为4.5μm.从ZnSe微米晶的光致发光谱图中可以看出样品在467 nm处存在一个较强的近带边发射峰,同时存在一个从540 nm至630 nm的很弱的与缺陷相关的发射带,这说明产物的结晶状况良好且具有良好的光致发光性能.

Study on Synthesis,Morphologies and PL Properties of ZnSe Micro Crystals

Well dispersed ZnSe micro crystals have been prepared by hydrothermal method using Zn （NO3 ）2 · 6H2O and Se as source materials without any surface-active agent. TG-DTA,X-ray diffraction （XRD）, scanning electron microscope （SEM）, and photolumineseence （PL） were used to investigate the thermostability, structure, morphologies and optical properties of ZnSe micro crystals. At room temperature, ZnSe micro crystals had a good thermostability and there was a major exotherm from 500 to 600 ℃. The results of XRD and SEM indicated that the as-prepared samples had the cubic zinc blende structure, and the average size of micro crystals was about 4.5 μm. Photoluminescence measurements were also carried out. The spectrum of ZnSe micro crystals exhibited a strong and stable emission peak at 467 nm which was the near-band-edge （NBE） emission peak, and meanwhile there was a weak defect-related emission band extending from 540 to 630 nm. The above results indicated that the micro crystals had good crystallization and photoluminescence properties.