Das, Sagnik and Ghorai, Uttam K and Dey, Rajib and Ghosh, Chandan K and Pal, Mrinal (2022) White light phosphorescence from ZnO nanoparticles for white LED applications. New Journal of Chemistry, 46 (36). pp. 17585-17595. ISSN 1144-0546

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White light emission from a pristine, solid material is currently the biggest challenge in the lighting industry. In this paper we report for the first time highly reproducible, stable, and intense white phosphorescence (similar to 4-32 mu s) from phase-pure zinc oxide (ZnO) nanopowder synthesized by a simple, low temperature process. The structure and morphology were studied by XRD, FESEM, and TEM. The white light consisted of narrow blue (centered at similar to 425 nm) and broad yellow-orange (centered at similar to 625 nm) photoluminescence and the best result was observed at (0.36,0.33) in the CIE plot. The presence of zinc interstitial (Zn-i) and oxygen interstitial (O-i) defects responsible for such white phosphorescence was confirmed by EDX, XPS, and Raman studies. The visibly bright white emission has appreciable quantum yield (similar to 12-14%) and cool/near cool correlated color temperature, rendering it suitable for W-LED applications. Further, a defect chemistry-based thermodynamic interpretation was invoked to adequately explain the white emission.

Item Type: Article
Subjects: Electronics
Depositing User: Bidhan Chaudhuri
Date Deposited: 29 Aug 2023 07:26
Last Modified: 29 Aug 2023 07:26
URI: http://cgcri.csircentral.net/id/eprint/5438

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