High thermal stability and blue-violet emitting phosphor CaYA1O₄:Ti⁴⁺with enhanced emission by Ca²⁺vacancies

Mao Xia^1,2,3，Yongli Zhang^1,2，Minghui Li¹，Yuan Zhong^1,2，Simin Gu^1,2，Nan Zhou^1,2，Zhi Zhou^1,2

1. College of Science,Hunan Agricultural University2. Hunan Optical Agriculture Engineering Technology Research Center3. State Key Laboratory of Powder Metallurgy,Central South University

摘 要：Blue-violet light can not only enhance the total content of biomass and glucoside but also enrich the taste of the fruit.Thus,it is meaningful to study the blue-violet luminescent materials for plant cultivation.In this study,titanium（IV）-activated CaYAlO₄（CYAO） phosphors were synthesized by conventional hightemperature solid-state reaction.X-ray powder diffraction was employed to analyze the crystalstructure of CYAO.It is found that the doped Ti⁴⁺ ions do not change obviously the crystal structure of phosphors.Upon 246 nm excitation,CaYAl_1-xO₄:xTi⁴⁺phosphors exhibit broad blue-violet emission band peaking at 395 nm,which can be attributed to the charge transfer of Ti⁴⁺-O^2-.Moreover,this phosphor exhibits strong thermal stability.The luminescence emission intensity at 150℃maintained about 91 mol% of its initial value at room temperature.Additionally,the electron transition process and concentration quenching mechanism of CaYAl_1-xO₄:xTi⁴⁺are discussed in detail.The excellent luminescent properties indicate that CaYAl_1-xO₄:xTi⁴⁺phosphor may have promising application in indoor plant cultivation.

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