Saha, Subhajit and Das, Swati and Sen, Dipayan and Ghorai, Uttam Kumar and Mazumder, Nilesh and Gupta, Bipin Kumar and Chattopadhyay, Kalyan Kumar (2015) Bane to boon: tailored defect induced bright red luminescence from cuprous iodide nanophosphors for on-demand rare-earth-free energy-saving lighting applications. Journal of Materials Chemistry C, 3 (26). 6786-6795 . ISSN 2050-7526

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The long standing controversy concerning the defect band in cuprous iodide (CuI) has been addressed in this paper from a technological point of view of its solid state lighting application. Recently, solid state lighting technology using nanophosphors has been proposed as the prime candidate in the energy saving lighting paradigm. Herein, we demonstrate a novel rare-earth free and non-toxic CuI nanophosphor, which has been synthesized via a facile solvothermal route. These nanophosphors are able to show ultra-bright and stable red emission under near UV excitation. The spectral features of this easily derived nanophosphor are not less than any rare-earth or cadmium based conventional phosphor. Furthermore, it has been conclusively verified that the deep red emission is strongly related to the excess iodine induced optimized defect level engineering in the band structure. The concepts and results presented in this paper clearly establish that the CuI nanophosphor is a promising 'green' material for the state-ofthe-art rare-earth free lighting and display applications.

Item Type: Article
Subjects: Materials Science
Applied Physics/Condensed Matter
Depositing User: Dr. Rajpal Walke
Date Deposited: 19 Sep 2016 06:30
Last Modified: 19 Sep 2016 06:30

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