Tawalare P K, Bhatkar V B, Omanwar S K, Moharil S V
Department of Physics, Sant Gadge Baba Amravati University, Amravati, India.
Department of Physics, Shri Shivaji Science College, Amravati, India.
Luminescence. 2018 Nov;33(7):1288-1293. doi: 10.1002/bio.3548. Epub 2018 Sep 14.
Intense near-infrared (NIR) emitting phosphors Ca (PO ) Cl:Eu ,Nd 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 Eu →Nd energy transfer. The efficiency of Eu →Nd energy transfer was as high as 80.8%. Two components observed in the decay curves could be identified with Eu substituting different Ca sites. Eu lifetimes were shortened after Nd doping. Near infra-red emission intensity was limited by Nd →Nd energy transfer and the consequent concentration quenching. The critical distance for Nd →Nd 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.
采用传统固相反应法合成了近红外（NIR）发射强的荧光粉Ca(PO)Cl:Eu,Nd，并通过X射线衍射、反射率、光致发光（PL）发射和PL激发（PLE）光谱以及PL寿命测量对其进行了表征。由于Eu→Nd能量转移，发射可以被nUV区域的宽带辐射激发。Eu→Nd能量转移效率高达80.8%。在衰减曲线中观察到的两个成分可以通过Eu取代不同的Ca位点来识别。Nd掺杂后Eu寿命缩短。近红外发射强度受到Nd→Nd能量转移及其导致的浓度猝灭的限制。Nd→Nd能量转移的临界距离估计为11.41 Å。吸收nUV辐射后转换为近红外表明其在太阳能光伏中的潜在应用。
