摘要
Langbeinite type compounds are a large kind of oxometallate with good flexibility structure.Herein,we synthesized a new langbeinite type compound K_(2)Dy_(1.5)Ta_(0.5)(PO_(4))_(3),in which the Dy^(3+)and Ta^(5+)were blended to occupy the same crystallographic sites.Simultaneously,solid solutions of K_(2)Dy_(1.5-x)Eu_(x)Ta_(0.5)(PO_(4))_(3)(x=0-1.5)were prepared and their photoluminescence properties were investigated.Due to energy transfer from Dy3+to Eu3+,both Dy3+and Eu3+characteristic emissions are observed under 393 nm light excitation.The emitting color of K_(2)Dy_(1.5-x)Eu_(x)Ta_(0.5)(PO_(4))_(3)turns from green through yellow to red by simply adjusting the Eu^(3+)concentration from 0 to 0.4.Moreover,K_(2)Dy_(1.48)Eu_(0.02)Ta_(0.5)(PO_(4))_(3)phosphor possesses excellent fluorescence thermal stability and exhibits zero thermal quenching at 150℃.These results manifest that K_(2)Dy_(1.5-x)Eu_(x)Ta_(0.5)(PO_(4))_(3)solutions are promising multi-color emitting phosphors candidate for near-UV LED.
基金
the National Natural Science Foundation of China(21201056)
Henan Postdoctoral Foundation,China(001801017)
Open Foundation of State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,China(2020-24)
Financing Plan for Key Young Teachers of Henan Province,China(2018GGJS062)。
