Synthesis and structural characterization of orange red light emitting Sm3+ activated BiOCl phosphor for WLEDs applications

Halappa, Pramod and Rajashekar, Harshitha M and Shivakumara, C (2019) Synthesis and structural characterization of orange red light emitting Sm3+ activated BiOCl phosphor for WLEDs applications. In: JOURNAL OF ALLOYS AND COMPOUNDS, 785 . pp. 169-177.

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Abstract

We report, synthesis of orange red light emitting Sm3+ activated BiOCl phosphors at relatively low temperature (400 degrees C) and shorter duration of 1 h. Rietveld refined results confirmed that all the compounds crystallized in the tetragonal structure with space group P4/nmm (No. 129). Functional group analysis were carried out by Fourier transform infrared (FT-IR) and Raman spectroscopy. The Photoluminescent (PL) experiment results reveal that, an intense PL transition at 598 nm ((4)G(5/2) -> H-6(7/2)) corresponds to orange red emission at lambda(ex) = 408 nm. The maximum emission intensity was observed for BiOCl: Sm3+ (3 mol%) phosphor, above this concentration quenching takes place due to charge exchange with neighboring Sm3+ ions. Time resolved fluorescence spectroscopic result reveals that, the decay curve is bi-exponential in nature and having long lifetime (tau = 0.58 ms). The obtained CIE and CCT values suggest that these phosphors having excellent color purity (similar to 90%) and low correlated color temperature. These results suggest that, Sm3+ activated BiOCl can be a potential red phosphor materials for WLEDs and other optoelectronics applications. (C) 2019 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF ALLOYS AND COMPOUNDS
Publisher:	ELSEVIER SCIENCE SA
Additional Information:	copyright for this article belongs to ELSEVIER SCIENCE SA
Keywords:	Bismuth oxy chloride; Sm3+ ion; Phosphors; Photo-luminescent; Color purity
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	27 May 2019 06:36
Last Modified:	27 May 2019 06:36
URI:	http://eprints.iisc.ac.in/id/eprint/62389

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