High luminescent brightness and thermal stability of red emitting Li3Ba2Y3(WO4)8:Eu3+ phosphor

Wang, Lei; Guo, Wenlei; Tian, Yue; Huang, Ping; Shi, Qiufeng; Cui, Cai’e

doi:10.1016/j.ceramint.2016.05.160

Cited by 43 publications

(15 citation statements)

References 23 publications

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“…Ultimately, activation energy Δ E is obtained as 0.539 eV. Therefore, the phosphor possesses better thermal resistance than other phosphor, such as Na 3 Sc 2 (PO 4 ) 3 :Eu 3+ (0.23 eV), Na 2 (Gd, Lu)(PO 4 )(MoO 4 ):Eu 3+ (0.22, 0.2 eV), Ca 3 (Gd, Lu)(AlO) 3 (BO 3 ) 4 :Eu 3+ (0.21, 0.315 eV), and Li 3 Ba 2 Y 3 (WO 4 ) 8 :Eu 3+ (0.27 eV) …”

Section: Resultsmentioning

confidence: 99%

Ca₅Ga₆O₁₄:Eu³⁺: A novel phosphor with outstanding heat resistance for white light‐emitting diodes

et al. 2019

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A novel red-emitting phosphor Ca 5 Ga 6 O 14 :Eu 3+ has been synthesized using solidstate method. The excitation and emission spectra show that the phosphor can emit the red light with the main peak at 611 nm under excitation of the 280 and 393 nm UV chip and the optimal Eu 3+ concentration is determined to be x = 0.07. Analysis of emission spectrum shows that Eu 3+ occupy the center of noninversion symmetry. With the increase of Eu 3+ doping concentration, the decay time is prolonged due to deeper energy trap arising from nonequivalent substitution. Additionally, the measured thermal stability with 0.539 eV activation energy and calculated 90.5% color purity of optimal phosphor indicate that the phosphor has an enormous application potential in w-LEDs industry.

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Section: Resultsmentioning

confidence: 99%

Ca₅Ga₆O₁₄:Eu³⁺: A novel phosphor with outstanding heat resistance for white light‐emitting diodes

et al. 2019

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“…In comparison, the emission intensity decreases rapidly with the increment of temperature owing to the NR phonon relaxation from the high populated energy level via crossover process and the possible channels for the thermal quenching are shown in the inset of Fig. 4(b) 25 . Furthermore, the relatively small optical band gap may also be reasonable for the sharply deceased emission intensity with the elevated temperature.…”

Section: Resultsmentioning

confidence: 98%

“…In comparison, the Eu 3+ ion, as an obbligato member of RE ions, is most frequently used as a red-emitting activator since its narrow red emission originating from 5 D 0 → 7 F 2 transition 23,24 . Up to date, some Eu 3+ -activated red-emitting phosphors, such as Li 3 Ba 2 Y 3 (WO 4 ) 8 :Eu 3+ , Ca 2 Ga 2 SiO 7 :Eu 3+ and Y 2 Mo 4 O 15 :Eu 3+ , were successfully synthesized 25–27 . However, these red-emitting phosphors suffer from narrow excitation bands and do not match well with the emitting band of NUV or blue LED chip which limits their promising applications in WLEDs.…”

Section: Introductionmentioning

confidence: 99%

Eu3+-activated La2MoO6-La2WO6 red-emitting phosphors with ultrabroad excitation band for white light-emitting diodes

2017

Sci Rep

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A series of novel Eu3+ -activated La 2 MoO 6 -La 2 WO 6 red-emitting phosphors have been successfully prepared by a citrate-assisted sol-gel process. Both photoluminescence excitation and emission spectra suggest that the resultant products have the strong ultrabroad absorption band ranging from 220 to 450 nm. Under the excitation of 379 nm, the characteristic emissions of Eu 3+ ions corresponding to the 5 D 0 → 7 F J transitions are observed in the doped samples. The optimal doping concentration for Eu 3+ions is found to be 12 mol% and the quenching mechanism is attributed to the dipole-dipole interaction. A theoretical calculation based on the Judd-Ofelt theory is carried out to explore the local structure environment around the Eu 3+ ions. The studied samples exhibit a typical thermal quenching effect with a T 0.5 value of 338 K and the activation energy is determined to be 0.427 eV. A near-ultraviolet (NUV)-based white light-emitting diode (LED) is packaged by integrating a mixture of resultant phosphors, commercial blue-emitting and green-emitting phosphors into an NUV LED chip. The fabricated LED device emits glaring white light with high color rendering index (84.6) and proper correlated color temperature (6492 K). These results demonstrate that the Eu 3+ -activated La 2 MoO 6 -La 2 WO 6 compounds are a promising candidate for indoor lighting as red-emitting phosphors.By virtue of admirable advantages of long working lifetime, energy saving, low cost, high luminous efficiency and environmental compatibility, the phosphor-converted white light-emitting diodes (WLEDs) which are considered as the next-generation illumination sources to supersede the conventional fluorescent lamps have been extensively used in indoor lighting, automobile displays and flashlights [1][2][3][4][5] . Presently, the commercial WLEDs which are made up of a blue-emitting InGaN LED chip and Y 3 Al 5 O 12 :Ce 3+ yellow-emitting phosphors suffer from poor color rending index (CRI ~ 70-80) and high correlated color temperature (CCT ~ 7000 K) as a result of inefficient red emission component [6][7][8] . To circumvent these drawbacks, a new strategy utilizing the near-ultraviolet (NUV) LED chip to pump the hybrid tricolor (blue, green and red) phosphors is performed to emit warm white light [9][10][11] . From the aforementioned combinations, one knows that the eventual behaviors of WLED devices can be significantly affected by the phosphors and they are expected to be efficiently excited by NUV or blue light. In comparison with commercial blue-emitting and green-emitting phosphors, the current red-emitting phosphors, by taking Y 2 O 2 S:Eu 3+ for example, still exhibit some unsatisfied characteristics such as weak absorption in the NUV/blue region, low luminous efficiency and poor stability 12,13 . In order to improve the performance of red-emitting phosphors, the nitride-and germanide-based red-emitting phosphors, such as Ca 2 Si 5 N 8 :Eu 2+ , Sr[LiAl 3 N 4 ]:Eu

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“…In the above process, the electron needs to absorb some energy to overcome a certain energy barrier (Δ E ); therefore, the greater the Δ E is, the more difficult the crossover process to occur . To better comprehend the relationship between emission intensity and temperature of NaCaTiTaO 6 : x Eu 3+ ( x = 0.02‐0.50) and confirm the activation energy of thermal quenching, the experimental data of NaCaTiTaO 6 : x Eu 3+ was fit by the Arrhenius equation:

I false(T false) = \frac{I_{0}}{1 + c exp (- E_{a} / k T)}

where I 0 and I ( T ) represent the emission intensity of the phosphor at temperature 300 K and T, c is a constant for any host, E a is the activation energy, k is the Boltzmann's constant (8.62 × 10 −5 eV/K). Figure displayed ln[( I 0 /I )−1] vs 1 /T .…”

Section: Resultsmentioning

confidence: 99%

Luminescence properties of novel Eu³⁺‐doped tantalate NaCaTiTaO₆ red‐emitting phosphors for solid‐state lighting

Sun

Zhong

et al. 2019

J Am Ceram Soc

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A novel tantalate red‐emitting phosphors NaCa1‐xEuxTiTaO6 (x = 0.02‐0.50) is synthesized via the traditional solid‐state reaction sintering. The photoluminescence properties, X‐ray diffraction (XRD), scanning electron microscopy (SEM), and thermal stability are characterized in detail. Photoluminescence spectra show strong red emission monitored at 614 nm at λex = 395 nm. The spectral properties exhibit excellent color purity and chromaticity coordinate (CIE) characteristics. White light‐emitting diodes (w‐LEDs) device are fabricated by the prepared phosphors and show high quality of color‐rendering index. The investigated results suggest that the Eu3+‐doped NaCaTiTaO6 phosphors can be as potential substitute red phosphors for w‐LEDs.

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High luminescent brightness and thermal stability of red emitting Li3Ba2Y3(WO4)8:Eu3+ phosphor

Cited by 43 publications

References 23 publications

Ca₅Ga₆O₁₄:Eu³⁺: A novel phosphor with outstanding heat resistance for white light‐emitting diodes

Ca₅Ga₆O₁₄:Eu³⁺: A novel phosphor with outstanding heat resistance for white light‐emitting diodes

Eu3+-activated La2MoO6-La2WO6 red-emitting phosphors with ultrabroad excitation band for white light-emitting diodes

Luminescence properties of novel Eu³⁺‐doped tantalate NaCaTiTaO₆ red‐emitting phosphors for solid‐state lighting

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High luminescent brightness and thermal stability of red emitting Li3Ba2Y3(WO4)8:Eu3+ phosphor

Cited by 43 publications

References 23 publications

Ca5Ga6O14:Eu3+: A novel phosphor with outstanding heat resistance for white light‐emitting diodes

Ca5Ga6O14:Eu3+: A novel phosphor with outstanding heat resistance for white light‐emitting diodes

Eu3+-activated La2MoO6-La2WO6 red-emitting phosphors with ultrabroad excitation band for white light-emitting diodes

Luminescence properties of novel Eu3+‐doped tantalate NaCaTiTaO6 red‐emitting phosphors for solid‐state lighting

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Ca₅Ga₆O₁₄:Eu³⁺: A novel phosphor with outstanding heat resistance for white light‐emitting diodes

Ca₅Ga₆O₁₄:Eu³⁺: A novel phosphor with outstanding heat resistance for white light‐emitting diodes

Luminescence properties of novel Eu³⁺‐doped tantalate NaCaTiTaO₆ red‐emitting phosphors for solid‐state lighting