title: Poly(vinylpyrrolidone) supported copper nanoclusters: glutathione enhanced blue photoluminescence for application in phosphor converted light emitting devices.
abstract: Poly(vinylpyrrolidone) supported Cu nanoclusters were synthesized by reduction of Cu(ii) ions with ascorbic acid in water, and initially showed blue photoluminescence with a quantum yield of 8%. An enhancement of the emission quantum yield has been achieved by treatment of Cu clusters with different electron-rich ligands, with the most pronounced effect (photoluminescence quantum yield of 27%) achieved with glutathione. The bright blue emission of glutathione treated Cu NCs is fully preserved in the solid state powder, which has been combined with commercial green and red phosphors to fabricate down-conversion white light emitting diodes with a high colour rendering index of 92.
authors.affiliation: Department of Physics and Materials Science and Centre for Functional Photonics (CFP), City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, China. andrey.rogach@cityu.edu.hk.
authors.forename: Zhenguang
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Physics and Materials Science and Centre for Functional Photonics (CFP), City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, China. andrey.rogach@cityu.edu.hk.
authors.forename: Andrei S
authors.initials: AS
authors.lastname: Susha
authors.affiliation: Department of Physics and Materials Science and Centre for Functional Photonics (CFP), City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, China. andrey.rogach@cityu.edu.hk and Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.
authors.forename: Bingkun
authors.initials: B
authors.lastname: Chen
authors.affiliation: Department of Physics and Materials Science and Centre for Functional Photonics (CFP), City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, China. andrey.rogach@cityu.edu.hk.
authors.forename: Claas
authors.initials: C
authors.lastname: Reckmeier
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Departments of Physical and Analytical Chemistry, Palacky University in Olomouc, 77146, Czech Republic.
authors.forename: Ondrej
authors.initials: O
authors.lastname: Tomanec
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Departments of Physical and Analytical Chemistry, Palacky University in Olomouc, 77146, Czech Republic.
authors.forename: Radek
authors.initials: R
authors.lastname: Zboril
authors.affiliation: Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.
authors.forename: Haizheng
authors.initials: H
authors.lastname: Zhong
authors.affiliation: Department of Physics and Materials Science and Centre for Functional Photonics (CFP), City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, China. andrey.rogach@cityu.edu.hk.
authors.forename: Andrey L
authors.initials: AL
authors.lastname: Rogach