Photoluminescence and energy storage traps in CaTiO3:Pr3+

Zhang, Xianmin; Cao, Chunyan; Zhang, Chenghua; Xie, Shiyao; Xu, G. S.; Zhang, Jiahua; Wang, Xiao Jun

doi:10.1016/j.materresbull.2010.09.022

Cited by 26 publications

(12 citation statements)

References 26 publications

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“…More interestingly, it is found Pr 3+ act not only as emissive ions but also as auxiliary ions for improving Ce 3+ LPL performance, similar to the cases in Pr 3+ : CaTiO 3 and Pr 3+ : CaO phosphors . Figure (c) shows the green persistent decay curves of Ce 3+ measured by varying Pr 3+ concentrations.…”

Section: Resultssupporting

confidence: 55%

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Ce³⁺/Pr³⁺: YAGG: A Long Persistent Phosphor Activated by Blue‐Light

Wang

Lin

et al. 2014

J. Am. Ceram. Soc.

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The requirement of using ultraviolet light to stimulate afterglow luminescence has seriously restricted indoors/outdoors applications of most persistent materials developed hitherto. Herein, efficient blue‐light‐activated Ce3+, Pr3+: YAGG phosphors, showing optimized long‐persistent luminescence lasting for 1 h, were prepared and investigated in detail with the aid of X‐ray diffraction refinement, steady‐state/persistent photoluminescence spectra, room/low‐temperature persistent decay curves, and three‐dimensional thermo‐luminescence spectra. Notably, the afterglow properties were found highly dependent on the Ga content which greatly alters both the host band gap energy and the Ce3+: 5d level structure and thus is beneficial to the electrons' photoionization and trapping processes. Moreover, Pr3+ additive was found not only prolonged the afterglow lifetime of Ce3+ through improving concentration of carriers captured at the trap, but also served as the red‐emissive centers for color tuning. The persistent energy transfer from Ce3+ to Pr3+ was experimentally demonstrated for the first time.

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Section: Resultssupporting

confidence: 55%

“…Unfortunately, the structure of the generated new traps is still unknown, and would be studied in our future work. One possibility is that Pr 3+ is easily converted to Pr 4+ which is known acted as electron traps for LPL …”

Section: Resultsmentioning

confidence: 99%

Ce³⁺/Pr³⁺: YAGG: A Long Persistent Phosphor Activated by Blue‐Light

Wang

Lin

et al. 2014

J. Am. Ceram. Soc.

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“…One study increased the Ca concentration, which led to an increase in trap states that were presumed to be oxygen vacancies [14]. The energies of these trap states were measured at different sintering temperatures and two traps were identified [15]. The first trap state was assigned to Pr 4+ and the energy of this trap state remained approximately 0.53 eV regardless of sintering temperature.…”

Section: Introductionmentioning

confidence: 99%

Increased fluorescence intensity in CaTiO3:Pr3+ phosphor due to NH3 treatment and Nb Co-doping

et al. 2016

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Development of next generation red phosphors for commercial lighting requires understanding of how increased luminescence is achieved by various treatment strategies. In this work, we compare co-doping with Nb to NH3 treatment of CaTiO3:Pr phosphors to reveal a general mechanism responsible for the increased luminescence. The phosphors were synthesized using standard solid-state synthesis techniques and the fluorescence was characterized for potential use in fluorescent lighting, with 254 nm excitation. The lifetime of the fluorescence was determined and used to identify a change in a trap state by the co-doping of Nb 5+ in the phosphor. The oxidation state of the Pr was probed by NEXAFS and revealed that both Nb 5+ co-doping and NH3 treatment reduced the number of nonfluorescing Pr 4+ centers. Calculations were performed to determine the energetically favorable defects. Vacuum annealing was also used to further probe the nature of the trap state. It was determined that NH3 treatments reduce the number of Pr 4+ non-fluorescing centers, while Nb 5+ co-doping additionally reduces the number of excess oxygen trap states that quench the fluorescence.

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“…The optical properties of a variety of rare-earth-doped perovskites structures have been reported. [7][8][9] We report here on the evidence for light-induced structural changes based on the fluorescent characteristics of Eu 3+ probe ions, which are well suited to detect changes in their local environment. [10][11][12][13][14] A series of europium doped PLZT ͑Eu:PLZT͒ ceramics with varying Zr/Ti compositions across the MPB were fabricated.…”

mentioning

confidence: 99%

“…The resulting ceramics were 4 mmϫ 4 mmϫ 0. 8 Optical measurements were performed on unpoled and poled samples. For the poling procedure, the PLZT samples were placed in silicone oil and heated to 130°C.…”

mentioning

confidence: 99%