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Peer-reviewedCC BYRSC advances

Concentration-driven structural evolution and enhanced photoluminescence dynamics in Ho3+-activated SrMoO4 nanophosphors

  • Arpitha H J1,2,3
  • Kartik Gopal4
  • Sunitha D V1,2
  • D. S. Prem Kumar1,2
  • Kalappa Prashantha5
5 affiliations
  1. 1Department of Physics, School of Applied Sciences, REVA University Bengaluru-560064 Karnataka India +91-7760884884
  2. 2Center for Advance Materials and Research in Physics, REVA Research Center, REVA University Bengaluru 560064 Karnataka India
  3. 3Department of Physics, Sri Adichunchanagiri First Grade College Channarayapatna, Hassan District-573116 Karnataka India
  4. 4Centre for Quality Assurance and Non-Destructive Evaluation (CQNDE), Sathyabama Institute of Science and Technology Chennai 600119 India
  5. 5ACU Centre for Research and innovation, Adichunchanagiri University Mandya District-571448 Karnataka India
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Abstract

Rare-earth-activated molybdate phosphors have attracted considerable interest because of their tunable structural and luminescence properties for photonic applications. In this work, Ho3+-doped SrMoO4 nanoparticles were synthesized through a controlled hydrothermal method employing Chikku (Manilkara zapota) leaf extract as a plant-derived processing additive. Structural characterization revealed the formation of a phase-pure tetragonal scheelite SrMoO4 structure for all investigated Ho3+ concentrations, with no detectable secondary crystalline phases. The observed structural changes are consistent with Ho3+ incorporation into the SrMoO4 host lattice, although direct confirmation of the substitutional site requires complementary characterization. The average crystallite size decreased from approximately 34 to 25 nm with increasing Ho3+ concentration from 1 to 7 mol%. UV-vis diffuse reflectance measurements showed a gradual modification of the absorption-edge profile, with the estimated optical band gap increasing from 4.10 to 4.17 eV. Under 451 nm excitation, the samples exhibited characteristic visible Ho3+ emissions, with prominent green and red emission bands near 545 and 658 nm, respectively. The relative emission intensity increased with Ho3+ concentration, reaching the highest value for the 7 mol% sample. Time-resolved photoluminescence measurements revealed a progressive increase in the emission lifetime from 148.62 µs for pristine SrMoO4 to 326.95 µs for the 7 mol% Ho3+-doped sample. No reduction in lifetime was observed within the investigated concentration range, indicating that significant concentration quenching is not evident up to 7 mol% Ho3+. Overall, the results demonstrate a concentration-dependent relationship between the structural characteristics, morphology, visible photoluminescence, and emission decay dynamics of Ho3+ activated SrMoO4 nanoparticles prepared through a plant-assisted hydrothermal route.

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Cite

BibTeXRIS
BibTeX
@article{h2026concentrationdriven,
  title = {{Concentration-driven structural evolution and enhanced photoluminescence dynamics in Ho3+-activated SrMoO4 nanophosphors}},
  author = {Arpitha H J and Kartik Gopal and Sunitha D V and D. S. Prem Kumar and Kalappa Prashantha},
  journal = {RSC advances},
  year = {2026},
  month = oct,
  doi = {10.1039/d6ra05779a},
  url = {https://europepmc.org/article/PMC/PMC13656410},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Concentration-driven structural evolution and enhanced photoluminescence dynamics in Ho3+-activated SrMoO4 nanophosphors
AU  - Arpitha H J
AU  - Kartik Gopal
AU  - Sunitha D V
AU  - D. S. Prem Kumar
AU  - Kalappa Prashantha
PY  - 2026
DA  - 2026/10/12
JO  - RSC advances
DO  - 10.1039/d6ra05779a
UR  - https://europepmc.org/article/PMC/PMC13656410
AB  - Rare-earth-activated molybdate phosphors have attracted considerable interest because of their tunable structural and luminescence properties for photonic applications. In this work, Ho3+-doped SrMoO4 nanoparticles were synthesized through a controlled hydrothermal method employing Chikku (Manilkara zapota) leaf extract as a plant-derived processing additive. Structural characterization revealed the formation of a phase-pure tetragonal scheelite SrMoO4 structure for all investigated Ho3+ concentrations, with no detectable secondary crystalline phases. The observed structural changes are consistent with Ho3+ incorporation into the SrMoO4 host lattice, although direct confirmation of the substitutional site requires complementary characterization. The average crystallite size decreased from approximately 34 to 25 nm with increasing Ho3+ concentration from 1 to 7 mol%. UV-vis diffuse reflectance measurements showed a gradual modification of the absorption-edge profile, with the estimated optical band gap increasing from 4.10 to 4.17 eV. Under 451 nm excitation, the samples exhibited characteristic visible Ho3+ emissions, with prominent green and red emission bands near 545 and 658 nm, respectively. The relative emission intensity increased with Ho3+ concentration, reaching the highest value for the 7 mol% sample. Time-resolved photoluminescence measurements revealed a progressive increase in the emission lifetime from 148.62 µs for pristine SrMoO4 to 326.95 µs for the 7 mol% Ho3+-doped sample. No reduction in lifetime was observed within the investigated concentration range, indicating that significant concentration quenching is not evident up to 7 mol% Ho3+. Overall, the results demonstrate a concentration-dependent relationship between the structural characteristics, morphology, visible photoluminescence, and emission decay dynamics of Ho3+ activated SrMoO4 nanoparticles prepared through a plant-assisted hydrothermal route.
SN  - 2046-2069
ER  -