Fabrication of a Functionally Graded Copper-Zinc Sulfide Phosphor

Jehong Park; Kwangwon Park; Jongsu Kim; Yongseok Jeong; Akira Kawasaki; Hansang Kwon

doi:10.1038/srep23064

Fabrication of a Functionally Graded Copper-Zinc Sulfide Phosphor

Sci Rep. 2016 Mar 14:6:23064. doi: 10.1038/srep23064.

Authors

Jehong Park¹, Kwangwon Park², Jongsu Kim², Yongseok Jeong², Akira Kawasaki³, Hansang Kwon^{1

4}

Affiliations

¹ Next-Generation Materials Co., Ltd. (NGM), Building-7, 365, Sinseon-ro, Busan 48547, Korea.
² Department of Display Engineering, Pukyong National University, Gaon-building, 905, Yongso-ro, Busan 48513, Korea.
³ Department of Materials Processing Engineering, Tohoku University, Sendai 980-8579, Japan.
⁴ Department of Materials System Engineering, Pukyong National University, Building-7, 365, Sinseon-ro, Busan 48547, Korea.

Abstract

Functionally graded materials (FGMs) are compositionally gradient materials. They can achieve the controlled distribution of the desired characteristics within the same bulk material. We describe a functionally graded (FG) metal-phosphor adapting the concept of the FGM; copper (Cu) is selected as a metal and Cu- and Cl-doped ZnS (ZnS:Cu,Cl) is selected as a phosphor and FG [Cu]-[ZnS:Cu,Cl] is fabricated by a very simple powder process. The FG [Cu]-[ZnS:Cu,Cl] reveals a dual-structured functional material composed of dense Cu and porous ZnS:Cu,Cl, which is completely combined through six graded mediating layers. The photoluminescence (PL) of FG [Cu]-[ZnS:Cu,Cl] is insensitive to temperature change. FG [Cu]-[ZnS:Cu,Cl] also exhibits diode characteristics and photo reactivity for 365 nm -UV light. Our FG metal-phosphor concept can pave the way to simplified manufacturing of low-cost and can be applied to various electronic devices.