Special Section on Optical Refrigeration and Radiation-Balanced Lasers

CdS bulk crystal growth by optical floating zone method: strong photoluminescence upconversion and minimum trapped state emission

[+] Author Affiliations
Ke-Zhao Du

Nanyang Technological University, School of Materials Science and Engineering, Singapore 639798, Singapore

Nanyang Technological University, School of Physical and Mathematical Sciences, Division of Physics and Applied Physics, Singapore 637371, Singapore

Xingzhi Wang

Nanyang Technological University, School of Physical and Mathematical Sciences, Division of Physics and Applied Physics, Singapore 637371, Singapore

Jun Zhang

Chinese Academy of Sciences, State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Beijing 100083, China

Xinfeng Liu

National Center for Nanoscience and Technology, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, Beijing 100190, China

Christian Kloc

Nanyang Technological University, School of Materials Science and Engineering, Singapore 639798, Singapore

Qihua Xiong

Nanyang Technological University, School of Physical and Mathematical Sciences, Division of Physics and Applied Physics, Singapore 637371, Singapore

Nanyang Technological University, School of Electrical and Electronic Engineering, NOVITAS, Nanoelectronics Centre of Excellence, Singapore 639798, Singapore

Opt. Eng. 56(1), 011109 (Nov 14, 2016). doi:10.1117/1.OE.56.1.011109
History: Received July 31, 2016; Accepted October 14, 2016
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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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Ke-Zhao Du ; Xingzhi Wang ; Jun Zhang ; Xinfeng Liu ; Christian Kloc, et al.
"CdS bulk crystal growth by optical floating zone method: strong photoluminescence upconversion and minimum trapped state emission", Opt. Eng. 56(1), 011109 (Nov 14, 2016). ; http://dx.doi.org/10.1117/1.OE.56.1.011109


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