Bane to boon: tailored defect induced bright red luminescence from cuprous iodide nanophosphors for on-demand rare-earth-free energy-saving lighting applications. Issue 26 (9th June 2015)

• Record Type: Journal Article
• Authors: Saha, Subhajit; Das, Swati; Sen, Dipayan; Ghorai, Uttam Kumar; Mazumder, Nilesh; Gupta, Bipin Kumar; Chattopadhyay, Kalyan Kumar
• Is Part Of: Journal of materials chemistry. Volume 3:Issue 26(2015)
• Page Start: 6786
• Page End: 6795
• Publication Date: 2015-06-09
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c5tc00719d
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Ultra-high red luminescence is demonstrated from rare-earth free as well as nontoxic cuprous iodide nanophosphors through controlled defect level engineering. Abstract : 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-of-the-art rare-earth free lighting and display applications.