Energy transfer and tunable photoluminescence of LaBWO 6 :Tb 3+ ,Eu 3+ phosphors for near-UV white LEDs

Li, Bin; Huang, Xiaoyong; Guo, Heng; Zeng, Yu‐Jia

doi:10.1016/j.dyepig.2017.11.003

Cited by 210 publications

(58 citation statements)

References 48 publications

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“…At the same time, the emission intensity from Bi 3+ (blue and green components) decreases with the increase of Eu 3+ content. While the emission intensity of red component increases with Eu 3+ content firstly, and reaches maximum at y = 20%, and then remarkably decreases due to concentration quenching effect . Above results indicate undoubtedly that the red emission of Eu 3+ in BYSO:3%Bi 3+ , y Eu 3+ phosphors comes from the ET process from Bi 3+ to Eu 3+ .…”

Section: Resultsmentioning

confidence: 70%

“…The broad band is assigned to charge transfer band (CTB) from the filled 2p orbital of O 2− to partially filled 4f shell of Eu 3+ . The sharp peaks at 361, 380, 393, and 464 nm are assigned to 7 F 0 → 5 G 2 , 5 L 7 , 5 L 6 , 5 D 2 transitions of Eu 3+ , respectively …”

Section: Resultsmentioning

confidence: 99%

“…Additionally, the ET efficiency η ET from Bi 3+ to Eu 3+ can be obtained by the following equation,

{normalη}_{ET} = 1 - I_{S} / I_{S 0}

where I S and I S0 are the relevant luminescence intensity of Bi 3+ ions with and without Eu 3+ dopant, respectively . The calculated η ET from Bi 3+ to Eu 3+ is depicted in Figure E‐F.…”

Section: Resultsmentioning

confidence: 99%

“…White light‐emitting diodes (W‐LED), have acquired growing attention in the past few decades because of their prominent characteristics such as high efficiency, long lifetime, and environmental friendliness . Currently, the commercial W‐LEDs are elaborated by the combination of Y 3 Al 5 O 12 :Ce 3+ yellow phosphors and blue InGaN LED chip . Owing to the lack of red spectral components, this strategy suffers low color rendering index and high correlated color temperature.…”

Section: Introductionmentioning

confidence: 99%

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Energy transfer and color‐tunable emission in Ba₂Y₂Si₄O₁₃:Bi³⁺,Eu³⁺ phosphors

et al. 2018

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Single‐composition Ba2Y2Si4O13:Bi3+,Eu3+ (BYSO:Bi3+,Eu3+) phosphors with color‐tunable and white emission were prepared by conventional high temperature solid‐state reaction method. The structural and luminescent properties of these phosphors were thoroughly investigated through X‐ray diffraction, photoluminescence, and decay curves. BYSO:Bi3+ phosphors show two excitation peaks at 342 and 373 nm, and give two emission peaks at 414 and 503 nm, respectively, indicating that there are two sites of Bi3+ in BYSO. The energy transfer from Bi3+ to Eu3+ was investigated in detail. Varied hues from blue (chromaticity coordinate [0.219, 0.350]) to white (0.288, 0.350) and orange‐red light (0.644, 0.341) can be generated by adjusting the content of Eu3+. Pure white light emission (0.311, 0.338) can be obtained under the excitation of 355 nm in BYSO:3%Bi3+,20%Eu3+ phosphor. Besides, BYSO:Bi3+,Eu3+ phosphors exhibit distinct thermal quenching properties, whose emission intensity at 473 K is 82.6% of that at 298 K. Our results indicate that BYSO:Bi3+,Eu3+ may be applied as conversion phosphors for n‐UV‐based W‐LEDs.

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Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 99%

“…Additionally, the ET efficiency η ET from Bi 3+ to Eu 3+ can be obtained by the following equation,

{normalη}_{ET} = 1 - I_{S} / I_{S 0}

where I S and I S0 are the relevant luminescence intensity of Bi 3+ ions with and without Eu 3+ dopant, respectively . The calculated η ET from Bi 3+ to Eu 3+ is depicted in Figure E‐F.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy transfer and color‐tunable emission in Ba₂Y₂Si₄O₁₃:Bi³⁺,Eu³⁺ phosphors

et al. 2018

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“…Usually, the concentration quenching mechanism will be contributed by the exchange interaction when the critical distance between the dopants is less than 5 Å, otherwise, it will be pertained by the multipole-multipole interaction when R c > 5 Å. 25 As the critical distance of Mn 2+ ions in the Cs 3 Cu 2 I 5 host lattice was much larger than 5 Å, it is reasonable to conclude that the multipole-multipole interaction would contrbute to the aforementioned concentration quenching mechanism. Figure 3C demonstrates the Commission Internationale de I'Eclairage (CIE) chromaticity diagram of the synthesized halides.…”

Section: Resultsmentioning

confidence: 99%

Neoteric Mn²⁺‐activated Cs₃Cu₂I₅ dazzling yellow‐emitting phosphors for white‐LED

Luo

Cheng

2019

J Am Ceram Soc

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Neoteric Mn2+‐activated Cs3Cu2I5 yellow‐emitting halides were achieved by the simple solid‐state reaction route. The near‐ultraviolet light was the suitable excitation lighting source for the resultant halides. The resultant halides exhibited bright yellow emission under the excitation of 378 nm and the optimum dopant content was 11 mol%. The multipole‐multipole interaction contributed to the concentration quenching mechanism and the critical distance was 28.65 Å. The thermal resistance of the prepared compounds was identified by the temperature‐dependent emission spectra. Ultimately, the designed light‐emitting diode showed bright white light with satisfied color rendering index, proper color coordinate, and suitable correlated color temperature. These results indicated that the prepared yellow‐emitting halides were suitable for indoor illumination.

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Mechanistic Insight into Energy‐Transfer Dynamics and Color Tunability of Na₄CaSi₃O₉:Tb³⁺,Eu³⁺ for Warm White LEDs

Huang

et al. 2020

Chemistry A European J

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In this work, al atent energy-transfer process in traditional Eu 3 + ,Tb 3 + -doped phosphorsi sp roposed and a new class of Eu 3 + ,Tb 3 + -doped Na 4 CaSi 3 O 9 (NCSO) phosphors is presentedw hich is enabled by luminescence decay dynamics that optimize the electron-transfer energy process. Relative to other Eu 3 + ,Tb 3 + -doped phosphors, the as-synthesized Eu 3 + ,Tb 3 + -doped NCSO phosphors show improved large-scale tunable emission color from green to red upon UV excitation,c ontrolled by the Tb 3 + /Eu 3 + doping ratio. Detailed spectroscopicm easurements in the vacuum ultraviolet (VUV)/UV/Vis region were used to determine the Eu 3 + -O 2À charge-transfer energy,4 f-5d transition energies, andt he energies of 4f excited multiplets of Eu 3 + and Tb 3 + with different 4f N electronic configurations. The Tb 3 + !Eu 3 + energy-transfer pathway in the co-doped sample was systematically investigated, by employing luminescence decay dynamics analysist oe lucidate the relevant energy-transfer mechanism in combination with the appropriate model simulation. To demonstrate their application potential, ap rototypew hitelight-emitting diode (WLED) device was successfully fabricated by using the yellow luminescence NCSO:0.03Tb 3 + , 0.05Eu 3 + phosphor with high thermal stabilitya nd aB a-MgAl 10 O 17 :Eu 2 + phosphor in combination with an ear-UV chip. These findings open up an ew avenuet or ealize and develop multifunctional high-performancep hosphors by manipulating the energy-transfer process forp ractical applications.

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Energy transfer and tunable photoluminescence of LaBWO 6 :Tb 3+ ,Eu 3+ phosphors for near-UV white LEDs

Cited by 210 publications

References 48 publications

Energy transfer and color‐tunable emission in Ba₂Y₂Si₄O₁₃:Bi³⁺,Eu³⁺ phosphors

Energy transfer and color‐tunable emission in Ba₂Y₂Si₄O₁₃:Bi³⁺,Eu³⁺ phosphors

Neoteric Mn²⁺‐activated Cs₃Cu₂I₅ dazzling yellow‐emitting phosphors for white‐LED

Mechanistic Insight into Energy‐Transfer Dynamics and Color Tunability of Na₄CaSi₃O₉:Tb³⁺,Eu³⁺ for Warm White LEDs

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Energy transfer and tunable photoluminescence of LaBWO 6 :Tb 3+ ,Eu 3+ phosphors for near-UV white LEDs

Cited by 210 publications

References 48 publications

Energy transfer and color‐tunable emission in Ba2Y2Si4O13:Bi3+,Eu3+ phosphors

Energy transfer and color‐tunable emission in Ba2Y2Si4O13:Bi3+,Eu3+ phosphors

Neoteric Mn2+‐activated Cs3Cu2I5 dazzling yellow‐emitting phosphors for white‐LED

Mechanistic Insight into Energy‐Transfer Dynamics and Color Tunability of Na4CaSi3O9:Tb3+,Eu3+ for Warm White LEDs

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Product

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Energy transfer and color‐tunable emission in Ba₂Y₂Si₄O₁₃:Bi³⁺,Eu³⁺ phosphors

Energy transfer and color‐tunable emission in Ba₂Y₂Si₄O₁₃:Bi³⁺,Eu³⁺ phosphors

Neoteric Mn²⁺‐activated Cs₃Cu₂I₅ dazzling yellow‐emitting phosphors for white‐LED

Mechanistic Insight into Energy‐Transfer Dynamics and Color Tunability of Na₄CaSi₃O₉:Tb³⁺,Eu³⁺ for Warm White LEDs