Renping Cao,Zibin Lai,Yewen Cao,Fangrui Cheng,Chenxing Liao,Shuijing Nie,Xuehua Yi,Jing Wang
Luminescent materials used in solid-state lighting usually face the challenge of the adjustment of luminescence properties. The coordinated luminescence of two activators in luminescent materials is a good method. Herein, CaAl2Si2O8:Dy3+, CaAl2Si2O8:Eu3+, and CaAl2Si2O8:Dy3+, Eu3+ with a pure phase (CaAl2Si2O8) were synthesized in air. The X-ray diffraction patterns of the samples were measured and their crystal structures were elucidated. Under excitation at 350 nm, the yellow emission of CaAl2Si2O8:Dy3+ in the spectral range of 525–800 nm was observed due to the 4F9/2 → 6H15/2, 6H13/2, 6H11/2, and 6H9/2 transitions of Dy3+ ions. CaAl2Si2O8:Eu3+ showed red emission in the range of 550–720 nm because of the transitions 5D0 → 7F1, 7F2, 7F3, and 7F4 of Eu3+ ions when it was excited by 394 nm light. A tunable color emission of CaAl2Si2O8:Dy3+, Eu3+ from yellow to red was found when the ratio between Dy3+ and Eu3+ ions was changed. We investigated the concentration-dependent spectra and ensured the optimal Dy3+ and Eu3+ concentrations in host CaAl2Si2O8. The spectra of the samples manifested the energy transfer from Dy3+ to Eu3+ ions. The energy-level diagrams of Dy3+ and Eu3+ ions were used to analyze the luminous mechanism of the samples. The research results are beneficial to the development of other Dy3+ and Eu3+ co-doped luminescence materials.
The orange-red phosphor, which combines persistent luminescence and mechanoluminescence , holds significant importance in advanced bioimaging and optical anti-counterfeiting. However, there are relatively few reports on this type of material currently. In this study, doping CaAl 2 Si 2 O 8 : Mn 2+ phosphor with Pr 3+ ions significantly increases the material's defect density. Under X-ray/UV excitation, the sample displays exceptional orange-red persistent luminescence and superior mechanoluminescence. More importantly, the samples exhibit the above properties in all temperature regions (including low temperature, room temperature (RT) and high temperature). Additionally, the material demonstrates excellent tissue penetration capabilities and dual-mode luminescence (persistent luminescence and mechanoluminescence), highlighting its potential for bioimaging and optical anti-counterfeiting applications.
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