Preparation, crystal structure and luminescence properties of a novel single-phase red emitting phosphor CaSr2(PO4)2:Sm3+,Li+

Chen, Yuying; Guo, Qingfeng; Liao, Libing; He, Meng; Zhou, Tianshuai; Mei, Lefu; Runowski, Marcin; Ma, Bin

doi:10.1039/c9ra00264b

Cited by 53 publications

(10 citation statements)

References 31 publications

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“…A significant reduction in lifetime decay values related to Bi 3+ emission with reference to concentration of Eu 3+ was observed which is consistent with the published data. [ 56 ] The presence of additional decay channels shortens the lifetime values of the ions in the excited state is the cause for the low lifetime values of the sensitizer ions (Bi 3+ ). The decrease in lifetime values of sensitizer ions with reference to increase in the activator content emphasizes the energy transfer process between Bi 3+ and Eu 3+ in the host lattice.…”

Section: Resultsmentioning

confidence: 99%

Tunable luminescence from Bi³⁺ sensitized La₂Zr₂O₇:Eu³⁺ red nanophosphors for display applications

Kumar

Venkatarao

Shaik³

et al. 2022

Luminescence

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Bismuth ion (Bi3+) sensitized, europium ion (Eu3+) activated La2Zr2O7 nanophosphors are prepared successfully by simple wet chemical method. Strong blue emission of singly doped La2Zr2O7 with Bi3+ was observed at 310 nm excitation, its wide emission spectrum has a peak maximum at 465 nm ascribed to electronic transition 3P1 → 1S0 of Bi3+. The recorded photoluminescence spectra of y at% Eu3+ codoped La2Zr2O7, when excited at 285 nm, the emission spectrum exhibits maximum peaks at wavelength values 615 nm, 646 nm and 665 nm which are ascribed to 5D0 → 7F2, 5D0 → 7F3 and 5D0 → 7F4 transitions of Eu3+ respectively. The chromaticity coordinates for the optimized sample were found to be (0.519, 0.329). Sensitizing with Bi3+ can affect the luminescence properties of La2Zr2O7:Eu3+ phosphors. With reference to the change in Eu3+ concentration from Y = 1, 2, 3, 4 and 5%, color tunable luminescence from blue to orange, red of La2Zr2O7:Bi3+,Eu3+ phosphors are observed. The lifetime decay values, energy level description and CIE chromatic color coordinates for Bi3+, Eu3+ in La2Zr2O7:Bi3+,Eu3+ codoped sample was discussed. The spectral overlap between sensitizer, activator ions confirms the efficient energy transfer from Bi3+ to Eu3+ in La2Zr2O7:Bi3+,Eu3+ codoped sample and is via a dipole‐quadruple mechanism.

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Section: Resultsmentioning

confidence: 99%

Tunable luminescence from Bi³⁺ sensitized La₂Zr₂O₇:Eu³⁺ red nanophosphors for display applications

Kumar

Venkatarao

Shaik³

et al. 2022

Luminescence

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“…For [27] have been extensively studied as white-light emitting phosphors for UV chip-based white LEDs. On the basis of literature studies and the summary of knowledge, we found that similar to the M 3 (PO 4 ) 2 (M = Ca, Sr, Ba) structure [28][29], among which CaSr 2 (PO 4 ) 2 is also a suitable host for phosphors [30]. The effect of Li + , Na + and K + co-doping on the luminescence enhancement of CaSr 2 (PO 4 ) 2 :Dy 3+ phosphors for white light-emitting diodes has been reported [31].…”

Section: Introductionmentioning

confidence: 92%

Crystal Structure and Luminescence Properties of a Thermally Stable Single-Phase White Emitting Phosphor CaSr2(PO4)2: Dy3+, Li+

Guo

Chen

Hao

et al. 2021

Preprint

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Single-phase CaSr2(PO4)2:Dy3+,Li+ phosphors were prepared using the high-temperature solid-state method in the air. To characterize the luminescence properties of the synthesized phosphors, Powder X-ray diffraction patterns (XRD), scanning electron microscopy images (SEM), photoluminescence spectra, and concentration-dependent emission spectra were measured to characterize the luminescence properties of the synthesized phosphors. The results showed that the CaSr2(PO4)2:Dy3+,Li+ phosphors exhibited white luminescence, and the emission spectra of the phosphors consisted of two sharp peaks at ≈486 and ≈578 nm (the most intense one). The optimum concentration of Dy3+ doping was determined to 0.06 mol.%. On the basis of the Dexter's theory, the mechanism of energy transfer between the Dy3+ ions was determined to dipole–dipole interactions. The results of the temperature-dependent luminescence confirmed that the as-prepared phosphors are proved to be promising UV-convertible material capable of white light emitting in UV-LEDs due to its excellent thermal stability and luminescence properties. Luminescence intensity and decay time of the CaSr2(PO4)2:Dy3+,Li+ phosphors were improved remarkably with the addition of charge compensators (Li+ ions), which would promote their applications in white light-emitting diodes based on the near-UV chip.

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“…Previous studies have found that adding alkali metal ions into the lattice may improve the luminescence properties of some phosphors [54,55]. However, the detailed mechanism was complex, and it should depend on the specific phosphors.…”

Section: Removing Vacancy Defects Via Alkali Metal Codopingmentioning

confidence: 99%

Anti-Defect engineering toward high luminescent efficiency in whitlockite phosphors

Pan

Mei

Zhuang

et al. 2022

Chemical Engineering Journal

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Preparation, crystal structure and luminescence properties of a novel single-phase red emitting phosphor CaSr₂(PO₄)₂:Sm³⁺,Li⁺

Abstract: Single-phase red emitting CaSr2(PO4)2:Sm3+,Li+ phosphors with good thermal stability were obtained.

Cited by 53 publications

References 31 publications

Tunable luminescence from Bi³⁺ sensitized La₂Zr₂O₇:Eu³⁺ red nanophosphors for display applications

Tunable luminescence from Bi³⁺ sensitized La₂Zr₂O₇:Eu³⁺ red nanophosphors for display applications

Crystal Structure and Luminescence Properties of a Thermally Stable Single-Phase White Emitting Phosphor CaSr2(PO4)2: Dy3+, Li+

Anti-Defect engineering toward high luminescent efficiency in whitlockite phosphors

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Preparation, crystal structure and luminescence properties of a novel single-phase red emitting phosphor CaSr2(PO4)2:Sm3+,Li+

Abstract: Single-phase red emitting CaSr2(PO4)2:Sm3+,Li+ phosphors with good thermal stability were obtained.

Cited by 53 publications

References 31 publications

Tunable luminescence from Bi3+ sensitized La2Zr2O7:Eu3+ red nanophosphors for display applications

Tunable luminescence from Bi3+ sensitized La2Zr2O7:Eu3+ red nanophosphors for display applications

Crystal Structure and Luminescence Properties of a Thermally Stable Single-Phase White Emitting Phosphor CaSr2(PO4)2: Dy3+, Li+

Anti-Defect engineering toward high luminescent efficiency in whitlockite phosphors

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Preparation, crystal structure and luminescence properties of a novel single-phase red emitting phosphor CaSr₂(PO₄)₂:Sm³⁺,Li⁺

Tunable luminescence from Bi³⁺ sensitized La₂Zr₂O₇:Eu³⁺ red nanophosphors for display applications

Tunable luminescence from Bi³⁺ sensitized La₂Zr₂O₇:Eu³⁺ red nanophosphors for display applications