BaZrSi3O9:Eu2+: a cyan-emitting phosphor with high quantum efficiency for white light-emitting diodes

Wang, De Yin; Huang, Chien Hao; Wu, Ying; Chen, Teng‐Ming

doi:10.1039/c1jm00080b

Cited by 128 publications

(46 citation statements)

References 24 publications

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“…[1][2][3][4][5] Commercial white LEDs are a combination of blue InGaN based LEDs with broadband yellow-emitting Y 3 Al 5 O 12 : Ce 3+ phosphor. However, due to the deficiency of red emission in the visible spectrum, this method has several disadvantages such as a low color-rendering index (CRI), high correlated color temperature, etc.…”

mentioning

confidence: 99%

Luminescence Properties of an Orange-Red Ba₅(BO₃)₂(B₂O₅):Sm³⁺Phosphor with High Color Purity

Zheng

Cheng

Chen

et al. 2015

ECS J. Solid State Sci. Technol.

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Ba 5-x (BO 3 ) 2 (B 2 O 5 ):xSm 3+ (0.01≤ x ≤ 0.15) orange-red phosphors were synthesized by conventional solid state reaction method. Its crystal structure, luminescence properties and concentration quenching mechanism were investigated. This phosphor can be effectively excited by 403 nm near ultraviolet light with the emission peaks located at 563, 600 and 648 nm, and features a satisfactory orange-red performance. It is shown that the optimal concentration of Sm 3+ ions in Ba 5 (BO 3 ) 2 (B 2 O 5 ):Sm 3+ is 7 mol%. The charge compensated behaviors, where Li + , Na + or K + is introduced to act as a charge compensator to enhance the photoluminescence intensity of Ba 5 (BO 3 ) 2 (B 2 O 5 ):Sm 3+ , were discussed. The results show that the emission intensity can be significantly improved by these charge compensators and that K + is the optimal one. In addition, the color purity and internal quantum efficiencies of typical samples were also investigated. It is shown that the phosphors with almost pure orange-red color purity and with a quantum efficiency of 16.0% (excited by 403 nm) can be obtained, which is higher than the commercial red phosphors Y 2 O 3 :Eu 3+ , Y 2 O 2 S:Eu 3+ with quantum efficiencies of 9.6% (excited by 394 nm) and 4.2% (excited by 395 nm), respectively. The present work suggests that the Ba 5 (BO 3 ) 2 (B 2 O 5 ):Sm 3+ phosphor is a promising high color purity orange-red material.With the advantages of long operation lifetime and energysaving, white light emitting diodes (LEDs) have been considered as a promising technology for next generation solid-state lighting systems. 1-5 Commercial white LEDs are a combination of blue InGaN based LEDs with broadband yellow-emitting Y 3 Al 5 O 12 : Ce 3+ phosphor. However, due to the deficiency of red emission in the visible spectrum, this method has several disadvantages such as a low color-rendering index (CRI), high correlated color temperature, etc. 5,6 To resolve this issue, an alternative way to produce white high CRI may be based on a combination of near ultraviolet (NUV) LEDs (350-420 nm) with red, green and blue emitting phosphors. 7,8 For example, BaMgAl 10 O 17 :Eu 2+ , Ca 2 PO 4 Cl:Eu 2+ are for blue component, 9,10 Sr 2 B 2 O 5 :Tb 3+ , (Sr, Ba) 2 SiO 4 :Eu 2+ are for green component 6,11 and Y 2 O 2 S:Sm 3+ , M 2 Si 5 N 8 :Eu 2+ (M = Ca, Sr, Ba) are for red component. 12,13 Hence, the development of novel phosphors which can be effectively excited by NUV light is rather meaningful. 14 Borates, which have excellent properties as a host structure of phosphor due to their inherent attributes of the large bandgap and covalent bond energy, have attracted great attention recently. 15 A large number of borate phosphors excited by NUV light have been reported and generally feature the advantages of a low synthesis temperature, excellent chemical and physical stability, 16,17 such as Sr 3 B 2 O 6 :Eu 2+ , 7 NaSrBO 3 :Ce 3+ , 18 LiBaBO 3 :Tb 3+ , 19 NaBa 4 (BO 3 ) 3 :Tb 3+20 and YAl 3 (BO 3 ) 4 :Tm 3+ . 21 However, to the best of our knowledge, no ...

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mentioning

confidence: 99%

Luminescence Properties of an Orange-Red Ba₅(BO₃)₂(B₂O₅):Sm³⁺Phosphor with High Color Purity

Zheng

Cheng

Chen

et al. 2015

ECS J. Solid State Sci. Technol.

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“…As Figure 4a shows, the PL and PLE spectra of KMg 4 (PO 4 ) 3 :0.06Eu 2+ overlap partially, which demonstrates the existence of energy transfer between Eu 2+ -Eu 2+ 19. As we know, two main mechanisms can be explanatory for the resonant energy-transfer: exchange interaction or electric multipolar interaction20.…”

Section: Resultsmentioning

confidence: 85%

Crystal structure and Temperature-Dependent Luminescence Characteristics of KMg4(PO4)3:Eu2+ phosphor for White Light-emitting diodes

Chen

Liu

Mei

et al. 2015

Sci Rep

115

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The KMg4(PO4)3:Eu2+ phosphor was prepared by the conventional high temperature solid-state reaction. The crystal structure, luminescence and reflectance spectra, thermal stability, quantum efficiency and the application for N-UV LED were studied respectively. The phase formation and crystal structure of KMg4(PO4)3:Eu2+ were confirmed from the powder X-ray diffraction and the Rietveld refinement. The concentration quenching of Eu2+ in the KMg4(PO4)3 host was determined to be 1mol% and the quenching mechanism was certified to be the dipole–dipole interaction. The energy transfer critical distance of as-prepared phosphor was calculated to be about 35.84Å. Furthermore, the phosphor exhibited good thermal stability and the corresponding activation energy ΔE was reckoned to be 0.24eV. Upon excitation at 365nm, the internal quantum efficiency of the optimized KMg4(PO4)3:Eu2+ was estimated to be 50.44%. The white N-UV LEDs was fabricated via KMg4(PO4)3:Eu2+, green-emitting (Ba,Sr)2SiO4:Eu2+, and red-emitting CaAlSiN3:Eu2+ phosphors with a near-UV chip. The excellent color rendering index (Ra = 96) at a correlated color temperature (5227.08K) with CIE coordinates of x = 0.34, y = 0.35 of the WLED device indicates that KMg4(PO4)3:Eu2+ is a promising blue-emitting phosphor for white N-UV light emitting diodes (LEDs).

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“…With increasing of Eu 3+ ions, the distance between Eu 3+ ions decreases, and the energy transfer rate among Eu 3+ and the probability of energy transfer to luminescent killer sites increase. Therefore, the lifetime is shorten with increasing Eu 3+ concentration [40].…”

Section: Luminescence Of Ba 079 Al 109 O 1714 :Xeumentioning

confidence: 99%

Color tunable Ba0.79Al10.9O17.14:xEu phosphor prepared in air via valence state control

et al. 2017

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A series of luminescent Ba 0.79 Al 10.9 O 17.14 :xEu (x = 0.005-0.12) phosphors were prepared by high-temperature solid-state reaction in air atmosphere. The coexistence of Eu 2+ and Eu 3+ was observed and verified by photoluminescence (PL) and photoluminescence excitation (PLE) spectra, X-ray photoelectron spectra (XPS), and diffuse reflection spectra. The band emission peaking at 430 nm was assigned to 4F 6 5D-4F 7 transition of Eu 2+ , and another four emissions peaking at 589, 619, 655, and 704 nm were attributed to 4F-4F transitions of 5 D 0 -7 F J (J = 1, 2, 3, 4) of Eu 3+ . The related mechanism of self-reduction was discussed in detail. The color of the Ba 0.79 Al 10.9 O 17.14 :xEu phosphors could be shifted from blue (0.23, 0.10) to red (0.42, 0.27) by doping Li + ions, and the temperature dependence properties were investigated.

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BaZrSi3O9:Eu2+: a cyan-emitting phosphor with high quantum efficiency for white light-emitting diodes

Cited by 128 publications

References 24 publications

Luminescence Properties of an Orange-Red Ba₅(BO₃)₂(B₂O₅):Sm³⁺Phosphor with High Color Purity

Luminescence Properties of an Orange-Red Ba₅(BO₃)₂(B₂O₅):Sm³⁺Phosphor with High Color Purity

Crystal structure and Temperature-Dependent Luminescence Characteristics of KMg4(PO4)3:Eu2+ phosphor for White Light-emitting diodes

Color tunable Ba0.79Al10.9O17.14:xEu phosphor prepared in air via valence state control

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BaZrSi3O9:Eu2+: a cyan-emitting phosphor with high quantum efficiency for white light-emitting diodes

Cited by 128 publications

References 24 publications

Luminescence Properties of an Orange-Red Ba5(BO3)2(B2O5):Sm3+Phosphor with High Color Purity

Luminescence Properties of an Orange-Red Ba5(BO3)2(B2O5):Sm3+Phosphor with High Color Purity

Crystal structure and Temperature-Dependent Luminescence Characteristics of KMg4(PO4)3:Eu2+ phosphor for White Light-emitting diodes

Color tunable Ba0.79Al10.9O17.14:xEu phosphor prepared in air via valence state control

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Luminescence Properties of an Orange-Red Ba₅(BO₃)₂(B₂O₅):Sm³⁺Phosphor with High Color Purity

Luminescence Properties of an Orange-Red Ba₅(BO₃)₂(B₂O₅):Sm³⁺Phosphor with High Color Purity