Rapid annealing-transformed, intense-red-emitting Eu-doped ZnGa2O4 nanoparticles with high colour purity, for very-high-resolution display applications

Hebbar, Deepak N and Choudhari, K S and Pathak, Nimai and Shivashankar, S A and Kulkarni, Suresh D (2019) Rapid annealing-transformed, intense-red-emitting Eu-doped ZnGa2O4 nanoparticles with high colour purity, for very-high-resolution display applications. In: MATERIALS RESEARCH BULLETIN, 119 .

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Abstract

Rapid annealing (RA), an eco-friendly, soft processing technique was employed to manipulate emission properties of nanocrystalline ZnGa1.99Eu0.01O4. With RA processing that lasts only minutes, nanocrystals with weak emission were transformed into intense red-emitting phosphor. Effect of RA process parameters: temperature, duration, and cycling, on emission properties has been thoroughly studied. Compared to furnace annealing that usually lasts hours, RA, which involves simple and inexpensive apparatus, is shown to be very efficient and beneficial, as the total process time is only 15 min. This swift processing leads to enhanced quantum yield and higher colour purity (84%), without grain growth. Even after RA at 900 degrees C, crystallites measure (similar to)7-8 nm, suggesting that they might serve as pixels for very-high-resolution applications. Two PL-lifetimes obtained, imply Eu3+ distribution (i) on the nanocrystal surface, (ii) within host-lattice (spinel gallate); the distribution changes gradually with RA. Judd-Ofelt analysis and spectroscopic analysis of the PL have been discussed in detail.

Item Type:	Journal Article
Publication:	MATERIALS RESEARCH BULLETIN
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	copyright for this article belongs to PERGAMON-ELSEVIER SCIENCE LTD
Keywords:	Rapid annealing; Eu-doped ZnGa2O4 nanoparticles; Judd-Ofelt analysis; Red phosphor; Colour purity
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	30 Oct 2019 11:54
Last Modified:	30 Oct 2019 11:54
URI:	http://eprints.iisc.ac.in/id/eprint/63703

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