ItemArticle

Photoluminescence, Judd-Ofelt and Thermoluminescence studies on bright red emitting CaY2O4:Eu3+ phosphor for display applications

Title
Photoluminescence, Judd-Ofelt and Thermoluminescence studies on bright red emitting CaY2O4:Eu3+ phosphor for display applications
Creator
Manners, Ovica; Aman, Shireen; Saji, Janita; Singh, Bholey; Pani, Balaram; Yadav, Ram Sagar; Rao, M.C.; Dubey, Vikas
Description
The Eu3+-doped CaY2O4 phosphors were synthesised via high-temperature solid-state method. The XRD analysis suggests an Orthorhombic-like phase of the phosphor, with Eu3+ ions effectively substituting Y3+ sites, while the crystallite size analysis (Scherrer and W-H) reveals dopant-induced grain growth accompanied by strain relaxation. The photoluminescence spectra show an intense red-emission at 610 nm under a broad UV-to-blue excitation, with 466 nm emerging as the most efficient excitation wavelength, highlighting compatibility with blue LED sources. Concentration quenching behaviour suggests excitation-wavelength dependence, with optimum Eu3+ concentration at 1.5 mol% under deep UV-excitation (257 nm), and 2 mol% under near-UV/visible (393532 nm) excitations. Dexter analysis indicates the dipole-dipole interactions dominated quenching in the visible region, while the unusually low Q value under deep UV-excitation suggests the host-activator transfer. The Judd-Ofelt analysis indicates a non-centrosymmetric Eu3+ environment, and CIE coordinates (x = 0.643, y = 0.356) with ?94 % high colour purity demonstrates the saturated red emission. Thermoluminescence study exhibits multiple traps with near-linear UV dose response, supporting dosimetric potential. The combined broad excitation, high emission intensity, and colour purity make the CaY2O4: Eu3+ a promising red phosphor for display and LED applications. 2025 Elsevier B.V.
Source
Journal of Molecular Structure;Volume;1352;Issue;;Article No.;144360;
Date
01-01-2026
Publisher
Elsevier B.V.
Subject
CaY2O4: Eu3+ phosphor; Dosimetry; Judd-Ofelt; Synthesis; w-LEDs
Coverage
Manners O., Department of Physics, North-Eastern Hill University, Meghalaya, Shillong, 793 022, India; Aman S., Department of Physics, North-Eastern Hill University, Meghalaya, Shillong, 793 022, India; Saji J., Department of Sciences and Humanities, School of Engineering and Technology, CHRIST University, Bengaluru, 560074, India; Singh B., Department of Chemistry, Swami Shraddhanand College, University of Delhi, Delhi, 110036, India; Pani B., Department of Chemistry, Bhaskaracharya College of Applied Sciences, University of Delhi, New Delhi, 110075, India; Yadav R.S., Institute of Science, Banaras Hindu University, Varanasi, 221 005, India; Rao M.C., Deparrment of Physics, Andhra Loyola College, Vijayawada, 520008, India; Dubey V., Department of Physics, North-Eastern Hill University, Meghalaya, Shillong, 793 022, India
Rights
Restricted Access; Hardcopy may be available in the library
Relation
ISSN: 222860; CODEN: JMOSB
Format
online
Language
English
Type
Article

Citation

Manners, Ovica; Aman, Shireen; Saji, Janita; Singh, Bholey; Pani, Balaram; Yadav, Ram Sagar; Rao, M.C.; Dubey, Vikas, “Photoluminescence, Judd-Ofelt and Thermoluminescence studies on bright red emitting CaY2O4:Eu3+ phosphor for display applications,” CHRIST (Deemed To Be University) Institutional Repository, accessed June 18, 2026, https://archives.christuniversity.in/items/show/22406.

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