Energy transfer and multicolour photoluminescence in phosphors La2O3 doped by Tm3⁺, Ho3⁺, and Eu3⁺ for white LED and security applications
Year: 2025
Type: article
Abstract: As the world evolves, the demand for efficient lighting sources is rising rapidly, and to cater to the burgeoning demand for swift expansion, technological advancement in white light-emitting diodes (WLEDs) and lighting materials is crucial. In this work, the photoluminescence of La 2 O 3 single-doped (Tm, Ho, Eu), double-doped and triple-doped phosphors prepared by combustion synthesis was studied. XRD confirms hexagonal phase (-P6c2c) with lattice contraction on doping, supported by Rietveld refinement, while SEM shows agglomerated particles (~ 12 µm) and FTIR confirms La–O bonding. Under UV excitation, Tm 3 ⁺, Ho 3 ⁺ , and Eu 3 ⁺ give blue, green, and orange-red emission, respectively; in Ho 3 ⁺ doped samples, the small 5 F₄– 5 S 2 gap (~ 200 cm⁻ 1 ) compared to host phonon energy (~ 400 cm⁻ 1 ) leads to merged emission. Efficient energy transfer (Tm → Ho, Ho → Eu, Tm → Eu) is observed in co-doped and tri-doped systems, with La 2 O 3 :Tm/Ho/Eu phosphor showing a strong red component. These results suggest La 2 O 3 —based phosphors are promising candidates for WLEDs, barcode security, and multicolour LED applications.
Source: Scientific Reports
Authors: Praful P. Khode, Aditi Deshmukh, Mateusz Czerwiński, Marta Michalska-Domańska, S. J. Dhoble
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,690
OpenAlex ID: W4417119933