Tunable luminescence properties and energy transfer of Ba3NaLa(PO4)3F:Tb3+,Sm3+ phosphors with apatite structure

A series of Tb 3? -Sm 3? -codoped Na 3 Bi(PO 4 ) 2 phosphors have been prepared by a high-temperature solid-state reaction, and their luminescence properties have been investigated in detail. The energy transfer process from Tb 3? to Sm 3? was verified through luminescence spectra and fluorescence decay curves. Moreover, the energy transfer mechanism was demonstrated to be the dipole-dipole interaction and the ET efficiency as well as quantum efficiency was also estimated. By controlling the doping content of the Sm 3? ions with the fixed Tb 3? content, the emission color of the obtained phosphors could be easily modulated from green to yellow and then to yellow-white. Additionally, as the temperature increases from RT to 150°C, the PL intensity of transition of Sm 3? decreased to 79 %, which prove good thermal stability of Na 3 Bi(PO 4 ) 2 :xSm 3? ,0.1Tb 3? phosphors. All the results indicate that the series of Na 3 Bi(PO 4 ) 2 :xSm 3? ,0.1Tb 3? phosphors can be acted as a good candidate for the application in white lightemitting diodes.

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“…to Sm 3? in Ba 3 NaLa (PO 4 ) 3 F phosphors [12]. All research results that Tb 3? can not only enhance the emission intensity of Sm 3?…”

Section: Introductionmentioning

confidence: 60%

Energy transfer, tunable luminescence, and thermal stability of Tb3+–Sm3+-codoped Na3Bi(PO4)2 phosphors

Zhang

Yang

et al. 2016

J Mater Sci

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“…The decay curves (Figure ) of Tb 3+ as a function of Dy 3+ concentration in phosphors CLPSF:0.20Tb 3+ , y Dy 3+ ( y = 0, 0.01, 0.05, 0.10, 0.15, and 0.30) were recorded and the corresponding lifetime values were estimated. In some case, the overlap integral of the fluorescence spectrum of the donor and the absorption spectrum of the acceptor during estimation due to weak electron phonon coupling are always omitted with doping of the Dy 3+ ions, the decay profile exhibit nonexponential due to the energy transfer process that takes place between the donor and acceptor ions (nearby Tb 3+ ions), therefore all of the decay curves could be expressed as a nonexponential fitting expression:

τ = \frac{\int_{0}^{t_{max}} t I false(normalt false) d t}{\int_{0}^{t_{max}} I (t)}

where I ( t ) is the integral intensity at time t . Herein, the average lifetime values ( τ ) were estimated to be 2.461, 2.319, 2.105, 1.883, and 1.522 ms in the as‐prepared phosphors CLPSF:0.20Tb 3+ , y Dy 3+ with y = 0, 0.01, 0.05, 0.10, and 0.30, respectively.…”

Section: Resultsmentioning

confidence: 99%

New apatite‐type phosphor Ca₉La(PO₄)₅(SiO₄)F₂:Tb³⁺,Dy³⁺ with improved color rendering index

et al. 2019

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Ca 9 La(PO 4 ) 5 (SiO 4 )F 2 :Tb 3+ ,Dy 3+ (CLPSF:Tb 3+ ,Dy 3+ ) phosphors were successfully prepared using the traditional solid-state technique. The crystal structure was refined and the luminescence properties have been examined in detail. The band gap and electronic structure of Ca 9 La(PO 4 ) 5 (SiO 4 )F 2 were performed by the periodic density functional theory (DFT) calculation. The spectral and fluorescence decay dynamics of CLPSF:Tb 3+ ,Dy 3+ show that the energy transfer behavior between Tb 3+ and Dy 3+ ions is observed. The CLPSF:Tb 3+ ,Dy 3+ phosphors can be efficiently excitable at the wavelengths range from 300 to 500 nm. The emission spectrum covers the whole visible part of the spectra with the sharp emission bands in red, green, and blue regions. The correlated color temperature (CCT) and color rendering index (CRI) of white light emission could be improved by the fine-tuning of the Tb 3+ and Dy 3+ ions ration in accordance with the energy transfer behavior. Thus, the CLPSF:Tb 3+ ,Dy 3+ phosphor could be used as a material for the near-ultraviolet (n-UV) and white lightemitting diodes (w-LEDs). K E Y W O R D Sapatite-type structure, CRI, energy transfer, n-UV-convertible phosphor, phosphor, w-LEDs

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“…The curve can be fitted well into a double-exponential function. The average fluorescence lifetime was defined as the following formula: 22 gradually decrease with the increasing of Eu 3+ concentration, demonstrating that it is possible to exist the energy transfer from Gd 3+ to Eu 3+ although this effect may be caused by much more defects [31][32][33][34].…”

Section: Photoluminescence Propertiesmentioning

confidence: 99%

Luminescent properties and energy transfer of Gd3+/Eu3+ co-doped cubic CaCO3

Sun

Zou

Zhang

et al. 2016

Journal of Luminescence

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Tunable luminescence properties and energy transfer of Ba3NaLa(PO4)3F:Tb3+,Sm3+ phosphors with apatite structure

Cited by 36 publications

References 35 publications

Energy transfer, tunable luminescence, and thermal stability of Tb3+–Sm3+-codoped Na3Bi(PO4)2 phosphors

Energy transfer, tunable luminescence, and thermal stability of Tb3+–Sm3+-codoped Na3Bi(PO4)2 phosphors

New apatite‐type phosphor Ca₉La(PO₄)₅(SiO₄)F₂:Tb³⁺,Dy³⁺ with improved color rendering index

Luminescent properties and energy transfer of Gd3+/Eu3+ co-doped cubic CaCO3

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Tunable luminescence properties and energy transfer of Ba3NaLa(PO4)3F:Tb3+,Sm3+ phosphors with apatite structure

Cited by 36 publications

References 35 publications

Energy transfer, tunable luminescence, and thermal stability of Tb3+–Sm3+-codoped Na3Bi(PO4)2 phosphors

Energy transfer, tunable luminescence, and thermal stability of Tb3+–Sm3+-codoped Na3Bi(PO4)2 phosphors

New apatite‐type phosphor Ca9La(PO4)5(SiO4)F2:Tb3+,Dy3+ with improved color rendering index

Luminescent properties and energy transfer of Gd3+/Eu3+ co-doped cubic CaCO3

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New apatite‐type phosphor Ca₉La(PO₄)₅(SiO₄)F₂:Tb³⁺,Dy³⁺ with improved color rendering index