Luminescent properties of a reddish orange emitting long-lasting phosphor CaO:Pr3+

Jin, Yahong; Hu, Yihua; Chen, Li; Wang, Xiaojuan; Mou, Zhongfei; Ju, Guifang; Liang, Feng

doi:10.1016/j.mseb.2013.07.009

Cited by 25 publications

(9 citation statements)

References 43 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%

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%

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

Wang

Lin

et al. 2014

J. Am. Ceram. Soc.

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“…As shown in Fig. (d), they can be well fitted using a double‐exponential decay function (3) as follows:

I = I_{1} exp false(- \frac{t}{italicτ_{1}} false) + I_{2} exp false(- \frac{t}{{italicτ}_{2}} false)

where I is the phosphorescence intensity; I 1 and I 2 are constants; τ 1 and τ 2 are decay times for the exponential components, which determine the rapid and slow decay processes, respectively; t is time. The fitting results of samples S1–S5 are listed in Table .…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Persistent Luminescence Mechanism of a Novel Orange Emitting Persistent Phosphor Sr₅(BO₃)₃Cl:Eu²⁺

Jin

Chen

et al. 2014

J. Am. Ceram. Soc.

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A series of Eu 2+ -doped Sr 5 (BO 3 ) 3 Cl phosphors were prepared successfully using a conventional solid-state reaction method. The luminescent properties were studied systematically by utilizing photoluminescence spectra, decay curves, persistent luminescence spectra, and thermoluminescence glow curves. Energy transfer from host to emission center Eu 2+ was affirmed. The orange persistent luminescence emission was observed for the first time. The optimal doping concentration of Eu 2+ for persistent luminescence was experimentally to be approximately 0.5% and the orange persistent luminescence duration can persist about 15 min. On the basis of the experimental results, a model was constructed and the relevant mechanism of persistent luminescence was illustrated in detail. Two different ways of trapping the charge carriers were also discussed.

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“…In order to identify the trapping mechanism, thermal luminescence (TL) glow curves are examined in Figure b. As shown, the reference sample of CaO exhibits a dominant band located at 434 K and a weak band at 350 K, corresponding to the oxygen vacancies ( V ′′ O ) and intrinsic defects, respectively . During synthesis of CaO, V ′′ O arises primarily from the breaking of CaO bonds during long‐term calcination at high temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Then, these electrons delocalize to be captured by traps (2). With thermal activation, the trapped electrons escape back to the CB (3), occupy 1 T 1u and generate the phosphorescent emission by recombination with thermally released holes . When Mn 2+ ions are doped into the host, the released electrons and holes can still lead to the generation of a certain degree of blue LPL (475 nm).…”

Section: Resultsmentioning

confidence: 99%

Wavelength‐Tunability and Multiband Emission from Single‐Site Mn²⁺ Doped CaO Through Antiferromagnetic Coupling and Tailored Superexchange Reactions

Song

Wang

et al. 2017

Advanced Optical Materials

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In modern phosphor materials, in contrast to single‐band emission, simultaneous photoluminescence through two or more emission bands enables broad and tailorable emission color, but requires fine control of activator precipitation on specific crystallographic sites. This presents a major obstacle in the design of tunable emitters, since dedicated control of site occupancy is rarely possible. Here, a new paradigm of tunability is considered, which overcomes this limitation. It is demonstrated in CaO:Mn2+ that single‐ and dual‐band emission can be generated by involving only a single type of crystallographic sites. This enables tailoring of the emission color alone through dopant concentration. The two emission bands exhibit different spectral, dynamic, and thermal characteristics, but very similar excitation spectra. While the variations in thermal quenching provide a tool for tunability, the variations in decay behavior suggest interesting potential for lifetime‐multiplexing and coding. Energy transfer is observed between the two emission bands, using time‐resolved emission spectra. From the analysis of crystal structure, spectral data, electron paramagnetic resonance analyses, and density functional theory calculations analyses, it is found that the emission bands at ≈600 and 660 nm originate from isolated Mn2+ ions and superexchange reactions in Mn2+ Mn2+ dimers, respectively.

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Luminescent properties of a reddish orange emitting long-lasting phosphor CaO:Pr3+

Cited by 25 publications

References 43 publications

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

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

Synthesis and Persistent Luminescence Mechanism of a Novel Orange Emitting Persistent Phosphor Sr₅(BO₃)₃Cl:Eu²⁺

Wavelength‐Tunability and Multiband Emission from Single‐Site Mn²⁺ Doped CaO Through Antiferromagnetic Coupling and Tailored Superexchange Reactions

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Luminescent properties of a reddish orange emitting long-lasting phosphor CaO:Pr3+

Cited by 25 publications

References 43 publications

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

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

Synthesis and Persistent Luminescence Mechanism of a Novel Orange Emitting Persistent Phosphor Sr5(BO3)3Cl:Eu2+

Wavelength‐Tunability and Multiband Emission from Single‐Site Mn2+ Doped CaO Through Antiferromagnetic Coupling and Tailored Superexchange Reactions

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Product

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

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

Synthesis and Persistent Luminescence Mechanism of a Novel Orange Emitting Persistent Phosphor Sr₅(BO₃)₃Cl:Eu²⁺

Wavelength‐Tunability and Multiband Emission from Single‐Site Mn²⁺ Doped CaO Through Antiferromagnetic Coupling and Tailored Superexchange Reactions