Er3+和Yb3+共掺ZnS纳米晶的合成及光学性能研究

Synthesis and Photoluminescence of Er3+ by Doping Yb3+ in ZnS Nanocrystals

摘要:

采用巯基乙酸为稳定剂水热法合成了ZnS:Er/Yb纳米晶。利用XRD、TEM、XPS和荧光光谱对合成的纳米晶进行物相、形貌、化学价态及荧光性能表征。结果表明：合成的纳米晶粒度约5nm,为闪锌矿结构；荧光光谱可知，激发波长为270nm时，发射光谱中主要出现了470 nm, 530 nm和 580 nm三个发射峰，且当合成温度为120℃时，发光峰强度最大。980nm激发纳米晶时，得到了Er离子在540 nm和 650 nm处4F3/2→4I15/2 和4F9/2→4I15/2的跃迁发射峰。

Abstract:

ZnS: Er/Yb nanocrystals were synthesized by the hydrothermal method using thioglycolic acid as a stabilizer. The crystalline phases, morphology, chemical bond states and photoluminescent properties of the nanoparticles were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoemission spectroscopy and fluorescence photometer. The results show that most prepared nanoparticles are spherical in shape with an average size of 5 nm, and have cubic zinc blende crystal structure. The emission spectrum of ZnS:Er/Yb nanocrystals excited at 270 nm displays three main peaks at 470 nm, 530 nm and 580 nm, and the intensity of fluorescence peaks is the strongest for nanocrystals prepared at 120 C. When ZnS:Er/Yb nanocrystals were excited at 980 nm, the emission peaks around 540 nm and 650 nm appeared, associated with the 4F3/2→4I15/2 and 4F9/2→4I15/2 of Er3+ ions transitions.