Tunable luminescence in co-doped Zn₃Al₂Ge₂O₁₀:Cr³⁺ by controlling crystal field splitting and nephelauxetic effect

Qiongyu Bai^1,2，Suling Zhao^1,2，Zheng Xu^1,2，Panlai Li³

1. Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University),Ministry of Education2. Institute of Optoelectronics Technology,Beijing Jiaotong University3. College of Physics Science & Technology,Hebei Key Lab of Optic-Electronic Information and Materials,Hebei University

摘 要：Ce³⁺/Dy³⁺/Tb³⁺/Eu³⁺/Mn²⁺and Cr³⁺ ions co-doped Zn₃ Al₂ Ge₂ O₁₀ phosphor were prepared by a hightemperature solid-state method.X-ray diffraction patterns prove the cubic phase structure of prepared Zn₃ Al₂ Ge2 O₁₀ phosphor,Emission,excitation spectra and decay curves confirm the tunable luminescence.Different degrees of the decrease of emission FWHM in Zn₃ Al₂ Ge2 O₁₀:0.02 Cr³⁺,RE(RE=Ce³⁺,Dy³⁺,Tb³⁺,Eu³⁺) and Zn₃ Al₂ Ge₂ O₁₀:0.02 Cr³⁺,Mn²⁺ are observed.The reason of variable FWHM is the effect of crystal field splitting and nephelauxetic effect,and the nephelauxetic effect is dominant.Therefore,the emission FWHM decreases with the increasing concentration of Mn²⁺/Tb³⁺/Eu³⁺in Zn₃ Al₂ Ge₂ O₁₀:0.02 Cr³⁺,and for Zn₃ Al₂ Ge2 O₁₀:0.02 Cr³⁺,Ce³⁺and Zn₃ Al₂ Ge2 O₁₀:0.02 Cr³⁺,Dy³⁺,it is a constant.The variation of Zn₃ Al₂ Ge₂ O₁₀:0.02 Cr³⁺,Tb³⁺ is more obvious than that of Zn₃ Al₂ Ge₂ O₁₀:0.02 Cr³⁺,Eu³⁺,because Tb³⁺ion has smaller electronegativity.Thus,the tunable luminescence of Cr³⁺ can be realized by co-doping different ions.And these phosphors have potential applications in light-emitting diodes for plant growth.

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