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Updated: Feb 5, 2026

Synthesis of Near-Infrared Emitting Gold Nanoclusters for Biological Applications
Published on: March 22, 2020
Near-infrared emitting Ca
P K Tawalare1, V B Bhatkar2, S K Omanwar1
1Department of Physics, Sant Gadge Baba Amravati University, Amravati, India.
Abstract:
Intense near-infrared (NIR) emitting phosphors Ca5 (PO4 )3 Cl:Eu2+ ,Nd3+ were synthesized using a conventional solid-state reaction method and characterized using X-ray diffraction, reflectance, photoluminescence (PL) emission and PL excitation (PLE) spectroscopy, and PL lifetime measurements. The emission could be excited by broad band radiation in the nUV region as a consequence of Eu2+ →Nd3+ energy transfer. The efficiency of Eu2+ →Nd3+ energy transfer was as high as 80.8%. Two components observed in the decay curves could be identified with Eu2+ substituting different Ca2+ sites. Eu2+ lifetimes were shortened after Nd3+ doping. Near infra-red emission intensity was limited by Nd3+ →Nd3+ energy transfer and the consequent concentration quenching. The critical distance for Nd3+ →Nd3+ energy transfer was estimated to be 11.41 Å. Absorption of nUV radiations followed by conversion to NIR indicated the potential application in solar photovoltaics.
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