Ca6La4(SiO4)2(PO4)4O2:Eu2+: a novel apatite green-emitting phosphor for near-ultraviolet excited w-LEDs

Xia, Yufei; Liu, Yangai; Huang, Zhaohui; Fang, Minghao; Мolokeev, Maxim S.; Mei, Lefu

doi:10.1039/c6tc01418f

Cited by 81 publications

(11 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the increasing of the doping concentration of Ce 3+ , the diffraction peak shifts to the lower 2θ because the larger radius of Ce 3+ is replaced by the smaller radius of Gd 3+ , when Tb 3+ is not mixed. The offset profile of diffraction peak demonstrates that Ce 3+ and Tb 3+ have been successfully introduced into the matrix material Ca 3 GdNa(PO 4…”

Section: Resultsmentioning

confidence: 95%

“…In recent years, many green phosphors based on apatite crystals have been reported. For example, the green phosphor Ca 6 La 4 (SiO 4 ) 2 (PO 4 ) 4 O 2 :0.01Eu 2+ prepared by Xia [4], its emission peak of 500 nm was emitted from the 4f and 6h positions occupied by Eu 2+ , and the quantum efficiency was 57.73%. Besides, Tian [5] prepared fluorescent powder Ca 9 Sr(PO 4 ) 6 Cl 2 :Ce 3+ ,Tb 3+ by high temperature solid phase method.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis, luminescence and energy transfer of Ca₃GdNa(PO₄)₃F: Ce³⁺, Tb³⁺ phosphor with novel apatite structure

Xie

Zhuo

Zhang

et al. 2019

Mater. Res. Express

View full text Add to dashboard Cite

A series of Ce 3+ /Tb 3+ singly doped and Ce 3+ , Tb 3+ co-doped Ca 3 GdNa(PO 4 ) 3 F phosphors were synthesized via high temperature solid-state reaction in a reductive atmosphere. The crystal, luminescence properties, energy transfer mechanism and thermal stability of the samples were investigated in detail. The Ce 3+ doped phosphors can be excited in the range from 250 to 330 nm. The Ce 3+ ,Tb 3+ co-doped phosphors exhibit characteristic emission of Ce 3+ and Tb 3+ simultaneously under the excitation of 301 nm. In addition, the energy transfer efficiency from Ce 3+ to Tb 3+ reaches as high as 78.6% when the doping amount of Tb 3+ is 0.20. The mechanism of energy transfer between Ce 3+ and Tb 3+ ions is demonstrated to be a dipole−dipole interaction. The luminescence characteristics show that this phosphor can be a platform for modeling a new phosphor and application in the solid-state lighting field.

show abstract

Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Synthesis, luminescence and energy transfer of Ca₃GdNa(PO₄)₃F: Ce³⁺, Tb³⁺ phosphor with novel apatite structure

Xie

Zhuo

Zhang

et al. 2019

Mater. Res. Express

View full text Add to dashboard Cite

show abstract

“…Furthermore, the multi‐phonon relaxation will lead to the increase of the non‐radiative rate . In addition, with the Eu 2+ concentration decreasing, the distance between Eu 2+ ions increases, which results in the decrease of energy transfer rate between Eu 2+ . The multi‐phonon relaxation and the decrease of energy transfer rate between Eu 2+ will decrease the phosphor luminescence efficiency, and lead to the serious CIE chromaticity shift for white LEDs.…”

Section: Resultsmentioning

confidence: 99%

Failure Mechanism of Phosphors in GaN‐Based White LEDs

Cao

Sun

et al. 2019

Physica Status Solidi (a)

View full text Add to dashboard Cite

The degradation and failure mechanisms of nitride phosphor in GaN-based white LEDs are studied using an in situ multi-functional accelerated life test and different analytical technologies. The electroluminescence results show that both the intensities of the blue emission (BL) from the LED chips and the yellow emission (YL) from the phosphors decrease with the stress time increasing. However, the YL/BL intensity ratio increases with a yellow shift for the chromaticity coordinates. The reason is not only due to the degradation of the LED chip but the nitride phosphors. The generated microcracks and delamination of phosphor layer lead to the increase of blue light absorption. Except for that, we find that the reason for the decrease of the phosphor conversion efficiency is related to the oxidization of the phosphor's luminescence center Eu 2þ ions instead of phosphor thermal quenching. These findings help further understand failure mechanism of phosphors during the operation, and improve the long-term color quality for the white LEDs.

show abstract

“…There is particular interest in the characterization of nanoapatite materials doped with optically active ions. Consequently, it is possible to successfully replace Ca 2+ ion by Eu 3+ [1,4,5], Ce 3+ [6], Tb 3+ [7], Dy 3+ [8,9], Nd 3+ [9,10], Sm 3+ [8,9] ions to obtain materials with characteristic emission in red [1,4], green [11,12], violet [6] as well as blue [6] spectral regions. Recently, the apatite matrix has been the focus of attention and investigated in terms of white light emission.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Physicochemical Properties of the Structurally Modified Nanosized Silicate-Substituted Hydroxyapatite Co-Doped with Eu3+ and Sr2+ Ions

Targońska

Wiglusz

2020

Nanomaterials

View full text Add to dashboard Cite

In this paper, a series of structurally modified silicate-substituted apatite co-doped with Sr2+ and Eu3+ ions were synthesized by a microwave-assisted hydrothermal method. The concentration of Sr2+ ions was set at 2 mol% and Eu3+ ions were established in the range of 0.5–2 mol% in a molar ratio of calcium ion amount. The XRD (X-ray powder diffraction) technique and infrared (FT-IR) spectroscopy were used to characterize the obtained materials. The Kröger–Vink notation was used to explain the possible charge compensation mechanism. Moreover, the study of the spectroscopic properties (emission, emission excitation and emission kinetics) of the obtained materials as a function of optically active ions and annealing temperature was carried out. The luminescence behavior of Eu3+ ions in the apatite matrix was verified by the Judd–Ofelt (J-O) theory and discussed in detail. The temperature-dependent emission spectra were recorded for the representative materials. Furthermore, the International Commission on Illumination (CIE) chromaticity coordinates and correlated color temperature were determined by the obtained results.

show abstract

Ca₆La₄(SiO₄)₂(PO₄)₄O₂:Eu²⁺: a novel apatite green-emitting phosphor for near-ultraviolet excited w-LEDs

Abstract: A novel green phosphor Ca6La4(SiO4)2(PO4)4O2:Eu2+ that fabricated with commercial blue and red phosphor coating on a n-UV chip.

Cited by 81 publications

References 37 publications

Synthesis, luminescence and energy transfer of Ca₃GdNa(PO₄)₃F: Ce³⁺, Tb³⁺ phosphor with novel apatite structure

Synthesis, luminescence and energy transfer of Ca₃GdNa(PO₄)₃F: Ce³⁺, Tb³⁺ phosphor with novel apatite structure

Failure Mechanism of Phosphors in GaN‐Based White LEDs

Investigation of Physicochemical Properties of the Structurally Modified Nanosized Silicate-Substituted Hydroxyapatite Co-Doped with Eu3+ and Sr2+ Ions

Contact Info

Product

Resources

About

Ca6La4(SiO4)2(PO4)4O2:Eu2+: a novel apatite green-emitting phosphor for near-ultraviolet excited w-LEDs

Abstract: A novel green phosphor Ca6La4(SiO4)2(PO4)4O2:Eu2+ that fabricated with commercial blue and red phosphor coating on a n-UV chip.

Cited by 81 publications

References 37 publications

Synthesis, luminescence and energy transfer of Ca3GdNa(PO4)3F: Ce3+, Tb3+ phosphor with novel apatite structure

Synthesis, luminescence and energy transfer of Ca3GdNa(PO4)3F: Ce3+, Tb3+ phosphor with novel apatite structure

Failure Mechanism of Phosphors in GaN‐Based White LEDs

Investigation of Physicochemical Properties of the Structurally Modified Nanosized Silicate-Substituted Hydroxyapatite Co-Doped with Eu3+ and Sr2+ Ions

Contact Info

Product

Resources

About

Ca₆La₄(SiO₄)₂(PO₄)₄O₂:Eu²⁺: a novel apatite green-emitting phosphor for near-ultraviolet excited w-LEDs

Synthesis, luminescence and energy transfer of Ca₃GdNa(PO₄)₃F: Ce³⁺, Tb³⁺ phosphor with novel apatite structure

Synthesis, luminescence and energy transfer of Ca₃GdNa(PO₄)₃F: Ce³⁺, Tb³⁺ phosphor with novel apatite structure