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Issue 34, 2017
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Novel multiple phosphorescence in nanostructured zinc oxide and calculations of correlated colour temperature

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Abstract

The design and development of novel and high quantum efficiency luminescent materials, such as phosphors, having tuneability in properties, have received tremendous interest among scientists. In this paper, we have achieved for the first-time multiple phosphorescence (blue and green) having a life-time of ∼10 μs in nanostructured zinc oxide that was synthesized using an easy and facile sol–gel method. Importantly, the photoluminescence (PL) intensity and the phosphorescence life-time could be tuned by controlling the annealing temperature under a reducing atmosphere. Temperature and atmosphere dependent variation of [VO] and Image ID:c7cp03631k-t1.gif has been interpreted by the detailed thermodynamic analysis of defect chemistry, for the first time. These nanostructured zinc oxide particles being sufficiently large in size (around 160 nm) are extremely stable and expected to show photoluminescence for a longer period of time than nanorods and quantum dots. The quantum yield was found to be as high as 13–15% which is comparable to the order of magnitude of that of quantum dots. The calculated correlated colour temperature is found to be suitable for cool lighting applications.

Graphical abstract: Novel multiple phosphorescence in nanostructured zinc oxide and calculations of correlated colour temperature

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Publication details

The article was received on 30 May 2017, accepted on 05 Aug 2017 and first published on 08 Aug 2017


Article type: Paper
DOI: 10.1039/C7CP03631K
Citation: Phys. Chem. Chem. Phys., 2017,19, 22995-23006
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    Novel multiple phosphorescence in nanostructured zinc oxide and calculations of correlated colour temperature

    S. Das, U. K. Ghorai, R. Dey, C. K. Ghosh and M. Pal, Phys. Chem. Chem. Phys., 2017, 19, 22995
    DOI: 10.1039/C7CP03631K

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