Photoluminescence Investigation of Naal₅o₈ and Naal₅o₈: Gd³⁺ (1 Mol%) Phosphor for Ultraviolet Emission Applications

Author(s)	Dr. MOHAN AMRUTRAO GAIKWAD
Country	India
Abstract	A comprehensive photoluminescence investigation of NaAl₅O₈ and NaAl₅O₈: Gd³⁺ (1 mol%) phosphor has been carried out to evaluate its suitability for ultraviolet photonic applications. The excitation spectrum of the doped sample exhibits sharp absorption bands at 275 nm and 312 nm corresponding to intra-4f transitions of Gd³⁺ ions. Upon excitation, intense ultraviolet emission centred at 312 nm is observed due to the characteristic 6P7/2→8S7/2^6P_{7/2} \right arrow ^8S_{7/2}6P7/2→8S7/2 transition of Gd³⁺. The undoped host shows weak broad defect-related emission, whereas Gd³⁺ doping significantly enhances emission intensity and spectral purity. The decay analysis reveals microsecond lifetime behaviour (~2 µs), confirming magnetic dipole transition dominance. Concentration quenching is governed by multipolar (dipole–dipole) interaction as estimated using the Blasse equation. CIE chromaticity coordinates (x ≈ 0.18, y ≈ 0.02) confirm near-UV emission. The results demonstrate that NaAl₅O₈: Gd³⁺ is a promising ultraviolet phosphor for advanced photonic and scintillation applications.
Keywords	Photoluminescence, Gd³⁺, NaAl₅O₈, Rare-earth phosphor, Ultraviolet emission, Concentration quenching
Field	Physical Science
Published In	Volume 17, Issue 1, January-March 2026
Published On	2026-02-27

About IJSAT Fees & Payment Current Issue Publication Archive	Submit Research Paper Track Submission Status Publication Guidelines Publication Ethics Peer Review & Plagiarism	Join as a Reviewer Editors & Reviewers Reviewer Referral Program Get Reviewer Membership Certi.	Website/Journal Policies Usage Policy Content Policies Privacy Policy

Contact Us	Message on WhatsApp	+91-9687-182-185	editor@ijsat.org

International Journal on Science and Technology