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Optical Engineering

CdS bulk crystal growth by optical floating zone method: strong photoluminescence upconversion and minimum trapped state emission
Author(s): Ke-Zhao Du; Xingzhi Wang; Jun Zhang; Xinfeng Liu; Christian Kloc; Qihua Xiong
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Paper Abstract

CdS materials have shown promise in optical refrigeration. However, the current success of laser cooling is still limited to nanobelt morphology. It is, therefore, important to explore whether bulk crystal growth technology could provide high-quality materials for laser cooling studies. Herein, we have demonstrated CdS bulk crystal growth by a modified optical floating zone method. The low temperature and continuous displacement of the CdS crystalline zone have resulted in high-quality CdS bulk crystals, which show strong photoluminescence upconversion with the absence of the long-wavelength and broad emission centered ∼700  nm that commercial CdS wafers usually exhibit. All these characterizations have confirmed the excellent stoichiometric nature and crystal quality of CdS bulk crystals, which is much better than the commercial counterparts for laser cooling studies.

Paper Details

Date Published: 14 November 2016
PDF: 5 pages
Opt. Eng. 56(1) 011109 doi: 10.1117/1.OE.56.1.011109
Published in: Optical Engineering Volume 56, Issue 1
Show Author Affiliations
Ke-Zhao Du, Nanyang Technological Univ. (Singapore)
Xingzhi Wang, Nanyang Technological Univ. (Singapore)
Jun Zhang, Institute of Semiconductors (China)
Xinfeng Liu, National Ctr. for Nanoscience and Technology of China (China)
Christian Kloc, Nanyang Technological Univ. (Singapore)
Qihua Xiong, Nanyang Technological Univ. (Singapore)

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