Ca[B8O11(OH)4] : Eu2+ – A Highly Efficient Deep Blue‐Emitting Phosphor Prepared by Low‐Temperature Self‐reduction

Liang, Pan; Wenli, Lian; Liu, Zhihong

doi:10.1002/chem.202101639

Cited by 8 publications

(4 citation statements)

References 82 publications

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“…当白光发光二极管(WLED)应用于高性能液晶显示器(LCD)的背光源时, 为了使呈现的画面更加清晰、生动和自然, 就需要色纯度更高的高效三基色荧光粉, 而色纯度的高低主要由发射峰的位置和半峰宽(FWHM)决定 [1][2][3] . 另外, 窄带发射(FWHM＜50 nm)的荧光粉还可以进一步提高 LCD 的能源效率 [4][5] .…”

Section: 引言unclassified

“…O 15 :yBi 3+ (0.1%≤y≤3%)的激发光谱和发射光谱的强度都先增加后减小, 在掺杂浓度为 0.5%时, 激发和发射光谱的强度最高, 这主要是浓度猝灭引起的 [1][2] . 根据量子效率计算公式可以计算最佳掺杂浓度为 0.5%时样品(Ba 3 Y 2 B 6 O 15 :0.5%Bi 3+ )的内外量子效率 [35] : [50] , 也高于同构的 Ba 3 Lu 2 B 6 O 15 :0.5%Bi 3+ [35] .…”

Section: [Bao9]与[bo3]和[yo6]/[sco6]又以共unclassified

“…表现了较好的热稳定性. 热猝灭的主要原因是当温度升高时会引起晶格振动增加, 从而导致激发态的光子以非辐射跃迁方式的概率增加, 辐射跃迁概率就降低了, 从而引起发光强度降低 [1,51] . 为了进一步评价热猝灭现象, 热猝灭活化能(E a )可由阿伦尼乌斯公式确定 [52][53] : ln(I0/IT-1)＝-Ea/kT ( 7) [27] , Ba 3 Lu 2 B 6 O 15 :Bi 3+ (E a ＝ 0.19 eV) [35] , Ba 3 Y(BO 3 ) 2 :Bi 3+ (E a ＝0.213eV) [54] .…”

Section: [Bao9]与[bo3]和[yo6]/[sco6]又以共unclassified

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An Efficient Narrow-band Blue-emitting Phosphor Ba₃Y₂B₆O₁₅:Bi³⁺ and Its Application

Liang,

Zhang,

Huang

et al. 2023

Acta Chimica Sinica

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At present, the development of efficient (high quantum efficiency and high thermal stability) narrow-band emitting phosphors is a crucial problem in the application of white light emitting diodes (WLED) for high-performance liquid crystal display (LCD) backlights. In this work, an efficient narrow-band blue emitting phosphor Ba3Y2B6O15:Bi 3+ was prepared by high temperature solid state method, and its structure and properties were characterized and calculated. By using the density functional theory (DFT), Ba3Y2B6O15 is calculated to be a direct band gap material with a high band gap value of 4.67 eV, which is a necessary condition for achieving high quantum efficiency phosphors. The experiment results show that Ba3Y2B6O15:0.5%Bi 3+ has a narrow-band blue-emitting spectrum with a full width at half maximum (FWHM) of 2168 cm −1 (36.2 nm) at 409 nm, which is owing to the 3 P1→ 1 S0 transition of Bi 3+ ions. The emission spectra of Ba3Y2B6O15:0.5%Bi 3+ can be split into two peaks at 406 and 422 nm, respectively, because there are two kinds of Y ions (Y1 and Y2) in the crystal cell of Ba3Y2B6O15. Under the 365 nm UV radiation, the Ba3Y2B6O15:0.5%Bi 3+ exhibits high internal quantum efficiency (IQE＝93.8%), and ultra-high color purity (98.9%). The high quantum efficiency and narrow-band emission spectrum are mainly due to the compact and highly symmetric crystal structure of Ba3Y2B6O15 matrix. The photoluminescence (PL) intensity of Ba3Y2B6O15:0.5%Bi 3+ remains 73.9% of the initial intensity at 150 ℃, and there is almost no color drift. The thermal quenching activation energy (Ea) of Ba3Y2B6O15:0.5%Bi 3+ was calculated to be 0.290 eV by the Arrhenius Equation, which indicates that Ba3Y2B6O15:0.5%Bi 3+ has high thermal stability. When Y 3+ is partially substituted by Sc 3+ , the emission spectrum of Ba3ScxY2-xB6O15:Bi 3+ (0 ≤ x ≤ 1.6) is redshifted with the increase of x. Finally, the blue phosphor Ba3Y2B6O15:0.5%Bi 3+ was mixed with commecial green and red phosphors and then coated them on a 365 nm chip to fabricate a WLED device. Under a driven current of 20 mA, the correlated color temperature of the obtained WLED is 5679 K and the color gamut can reach 95.3% NTSC. Above results indicate that Ba3Y2B6O15:Bi 3+ is a promising phosphor for high-performance LCD backlights. Keywords highly-efficient phosphor; narrow-band emitting; blue phosphor; Ba3Y2B6O15:Bi 3+

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Section: 引言unclassified

Section: [Bao9]与[bo3]和[yo6]/[sco6]又以共unclassified

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An Efficient Narrow-band Blue-emitting Phosphor Ba₃Y₂B₆O₁₅:Bi³⁺ and Its Application

Liang,

Zhang,

Huang

et al. 2023

Acta Chimica Sinica

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“…However, most phosphors currently used in pc-WLEDs are based on low-valent Eu 2+ activator ions, which are synthesized under harsh conditions (1800 °C and 0.9 MPa N 2 pressure) and, in addition, are susceptible to oxidation at high temperatures leading to shifts in the color coordinates. The ideal way to overcome these problems is to keep the low-valent ions stable in the air environment such as in Sr/Ca[B 8 O 11 (OH) 4 ]:Eu; 9,10 CaAl 2 Si 2 O 8 :Eu; 11 α-Ca 3 (PO 4 ) 2 :Eu; 12 M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) 13 or to use the Eu 3+ → Eu 2+ self-reduction to achieve excellent thermal stability. Compared to rare earth ions, Mn 4+ , a commonly used red phosphor activator with excellent optical properties and low cost, can be self-reduced in some unique crystal structures in an air environment (Mn 4+ → Mn 2+ ), e.g.…”

Section: Introductionmentioning

confidence: 99%

Self-reduction of Mn⁴⁺ to Mn²⁺: NaY₉Si₆O₂₆:Mn²⁺ red phosphors with excellent thermal stability for NUV LEDs

Liu

et al. 2023

J. Mater. Chem. C

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Fabrication of Highly Luminescent and Thermally Stable Phosphors through In‐Situ Formation of BaSO₄ on Sulfur Nanodots

Guo

Feng

Shi

et al. 2022

Chemistry A European J

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Producing high performance phosphors using abundant and non‐toxic precursors yet straightforward methods are promising but still a challenging task. Herein, highly luminescent and thermally stable phosphors were fabricated through an in situ precipitation synthesis strategy. Sulfur nanodots (S‐dots) act as the precursors for precipitation reactions and also provide the luminescent centers. Structural and optical characterization investigations suggest that S‐dots are incorporated in the matrix of BaSO4, and BaSO4 provides passivation effect for the surface ligands or traps of S‐dots. This results in the promotion of photoluminescence quantum yield from 23 % to 58 %, and the BaSO4 matrix also leads to the obvious promotion of thermal stability. These merits endow the construction of phosphor‐based light‐emitting diodes by utilizing the S‐dots@BaSO4 hybrid phosphors as a color conversion layer. These research results are significant for developing sulfur‐based luminescent materials, and also provide a solid and universal theory to produce high quality phosphors.

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Ca[B₈O₁₁(OH)₄] : Eu²⁺ – A Highly Efficient Deep Blue‐Emitting Phosphor Prepared by Low‐Temperature Self‐reduction

Cited by 8 publications

References 82 publications

An Efficient Narrow-band Blue-emitting Phosphor Ba₃Y₂B₆O₁₅:Bi³⁺ and Its Application

An Efficient Narrow-band Blue-emitting Phosphor Ba₃Y₂B₆O₁₅:Bi³⁺ and Its Application

Self-reduction of Mn⁴⁺ to Mn²⁺: NaY₉Si₆O₂₆:Mn²⁺ red phosphors with excellent thermal stability for NUV LEDs

Fabrication of Highly Luminescent and Thermally Stable Phosphors through In‐Situ Formation of BaSO₄ on Sulfur Nanodots

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Ca[B8O11(OH)4] : Eu2+ – A Highly Efficient Deep Blue‐Emitting Phosphor Prepared by Low‐Temperature Self‐reduction

Cited by 8 publications

References 82 publications

An Efficient Narrow-band Blue-emitting Phosphor Ba3Y2B6O15:Bi3+ and Its Application

An Efficient Narrow-band Blue-emitting Phosphor Ba3Y2B6O15:Bi3+ and Its Application

Self-reduction of Mn4+ to Mn2+: NaY9Si6O26:Mn2+ red phosphors with excellent thermal stability for NUV LEDs

Fabrication of Highly Luminescent and Thermally Stable Phosphors through In‐Situ Formation of BaSO4 on Sulfur Nanodots

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Product

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Ca[B₈O₁₁(OH)₄] : Eu²⁺ – A Highly Efficient Deep Blue‐Emitting Phosphor Prepared by Low‐Temperature Self‐reduction

An Efficient Narrow-band Blue-emitting Phosphor Ba₃Y₂B₆O₁₅:Bi³⁺ and Its Application

An Efficient Narrow-band Blue-emitting Phosphor Ba₃Y₂B₆O₁₅:Bi³⁺ and Its Application

Self-reduction of Mn⁴⁺ to Mn²⁺: NaY₉Si₆O₂₆:Mn²⁺ red phosphors with excellent thermal stability for NUV LEDs

Fabrication of Highly Luminescent and Thermally Stable Phosphors through In‐Situ Formation of BaSO₄ on Sulfur Nanodots