【作者】 陈岩； 王静； 苏锵；

【Author】 Yan Chen,Jing Wang~*,Qiang Su (Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistiy,State Key Laboratory of Optoelectronic Materials and Technologies,School of Chemistry and Chemical Engineering,Sun Yat-sen University,Guangzhou,Guangdong 510275,P.R.China)

【机构】 生物无机与合成教育部重点实验室光电材料与技术国家重点实验室,中山大学化学与化学工程学院；

【摘要】 本文采用高温固相法合成一种新型近红外发光材料KBaPO₄:Eu²⁺,Pr³⁺,通过x射线粉末衍射,室温和3K下的激发与发射光谱及荧光衰减等手段,系统研究了荧光粉KBaPO₄:Eu²⁺,Pr³⁺的在紫外-可见-近红外的稳态和瞬态光谱性质。数据显示,这种荧光粉可以有效吸收250-600nm紫外-可见光,同时,发射位于960-1060nm强的近红外光,此近红外发射与硅基太阳能电池的最大光谱响应非常匹配。本文首次利用敏化离子Eu²⁺的宽且强的4f-5d跃迁,吸收近紫外光,并将能量传递给发光中心Pr³⁺离子,实现Pr³⁺离子在近红外区的强发射,并提出了Eu²⁺-Pr³⁺之间的能量传递机制与规律。这为未来高效太阳光吸收与增强硅基太阳能电池效率的稀土波长转换材料提供了新的研究思路。更多还原

【Abstract】 An efficient near-infrared emitting KBaPO₄:Eu²⁺,Pr³⁺ phosphor promising as solar spectral converter for Si solar cells is successfully developed by solid state chemistry.The UV-Vis-NIR optical properties of KBaP04:Eu²⁺,Pr³⁺ are systematically investigated by using the XRD patterns, photoluminescence excitation and emission spectra at room temperature and 3 K,and the decay curves. The UV/Vis-to-NIR energy transfers in KBaPO₄:Eu²⁺,Pr³⁺ are proposed based on these results.The results show that it can harvest UV-Vis photons and exhibits an intense near-infrared（NIR） emission of Pr³⁺ between 960-1060nm,perfectly matching the maximum spectral response of Si solar cells.It demonstrates for the first time that Pr³⁺ ion can be an efficient NIR emitting center promising as solar spectral converter for Si solar cells and Eu²⁺ ion can be an efficient sensitizer harvesting UV photon and greatly enhancing NIR emission of Pr³⁺ ion through efficient energy feeding by allowed 4f-5d absorption of Eu²⁺ ion with high oscillator strength.We believe this new NIR emitting phosphor may open a new route to the design of advanced UV/Vis-to-NIR phosphors promising for Si solar cells.更多还原