International Journal on Science and Technology

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“Concentration-Dependent Photoluminescence & Thermoluminescence Properties of Eu3+ Doped CaF2 Phosphors.”

Author(s) Ms. Usha Yadav Yadaw, Prof. Dr. Jagjeet Kaur Saluja, Dr. Abhishek Kumar Misra
Country India
Abstract In the present study conventional solid state reaction method was used to successfully synthesize a series of Eu3+ doped CaF2 phosphors for 0.1- 2.5 mol% of Eu3+ ions. In this study investigate its structural, vibration and optical properties. X-ray diffraction analysis confirms the phase purity and crystalline nature of the prepared phosphor and which revealed a cubic structure without any detectable impurity phases. The FTIR (Fourier Transform Infrared Spectroscopy) is used to examine the vibrational characteristics and bonding nature of the prepared sample. Under the UV excitation Eu3+ doped CaF2 phosphor demonstrate strong emission in visible spectrum, specially while the photoluminescence excitation peaked at 280 nm, in the emission spectra broad band centered at 611 nm(5D0→7F2), due to the electronic transitions of Eu3+ ions. While literature reports on chemically synthesized CaF2:Eu3+ often exhibit early concentration quenching or require co-doping to enhance intensity but we observed in the present study PL intensity significantly influenced by the activator (Eu3+), the emission intensity increases with rise concentration of Eu3+ ion up to 2.0 mol%, after that concentration quenching occurs, which is relatively high concentration of 2.0 mol%. Most significantly, thermoluminescence (TL) studies revealed a well-defined glow peak, indicating the presence of trapping centers linked to Eu3+ ions. Compared to commercial dosimeters, the synthesized phosphor has highest intensity recorded at a 0.1 kGy dose for 1.5 mol% sample, the kinetic parameters such as, frequency factor, activation energy and order of kinetics calculated using peak shape method. These comparative findings establish this phosphor as a more robust and highly promising for application in LED technology and highly sensitive alternative for advanced radiation dosimetry applications.
Keywords Keywords: Solid state, CaF2, Eu3+, PL, TL & LEDs.
Field Physical Science
Published In Volume 17, Issue 3, July-September 2026
Published On 2026-09-21
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Crossref DOI prefix of IJSAT is 10.71097/IJSAT

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