Abstract
Intense blue and near-infrared emissions were observed in Ca10(PO4)6O:Eu2+ and Ca10(PO4)6O:Eu2+,Nd3+ phosphors. The emissions can be excited by broad band in near ultraviolet region. Blue emission is characterized by CIE coordinates 0.1519, 0.0696 which can be useful as a blue component of LED lamp based on near ultraviolet chips. Near-infrared emission is obtained as a consequence of Eu2+→Nd3+ energy transfer. The efficiency of Eu2+→Nd3+ energy transfer is as high as 95%. Fast (10 ns) and slow (300 ns) components observed in decay curves could be identified with isolated Eu2+ and Eu2+ ions near Nd3+, respectively. NIR Emission intensity is limited by Nd3+→Nd3+ energy transfer and the consequent concentration quenching. Critical distances for Eu2+→Eu2+ and Nd3+→Nd3+ energy transfers are 18.86 and 12.62 Å, respectively. Absorption of near ultraviolet radiations followed by conversion to blue/NIR indicates the potential applications in solid state lighting and solar photovoltaics.
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