Enhanced Optical Performance of BaMgAl10O17:Eu2+ Phosphor by a Novel Method of Carbon Coating

Yin, Liangjun; Dong, Jun; Wang, Yinping; Zhang, Bi; Zhou, Zijiang; Wu, Mengqiang; Xu, Xin; Ommen, J. Ruud van; Hintzen, H. T.

doi:10.1021/acs.jpcc.5b10215

Cited by 54 publications

(33 citation statements)

References 31 publications

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“…The internal quantum efficiency (IQE) and external quantum efficiency (EQE) of BAM is about 91% and 65%, respectively. To further improve the QE and thermal stability of BAM, carbon coating had been adopted by Yin et al via chemical vapor deposition (CVD) (Yin et al, 2016). The IQE and EQE were demonstrated to increase up to 95% and 76%, and the thermal degradation decreased from 20% to 4.6%.…”

Section: Introductionmentioning

confidence: 99%

Pyrophosphate Phosphor Solid Solution with High Quantum Efficiency and Thermal Stability for Efficient LED Lighting

et al. 2020

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Phosphors with high quantum efficiency and thermal stability are greatly desired for lighting industries. Based on the design strategy of solid solution, a series of deep-blue-emitting phosphors (Sr 0.99-x Ba x) 2 P 2 O 7 :0.02Eu 2+ (SB x PE x = 0-0.5) are developed. Upon excitation at 350 nm, the optimized SB 0.3 PE phosphor shows a relatively narrow full width at half maximum (FWHM = 32.7 nm) peaking at 420 nm, which matches well with the plant absorption in blue region. Moreover, this phosphor exhibits obvious enhancement of internal quantum efficiency (IQE) (from 74% to 100%) and thermal stability (from 88% to 108% of peak intensity and from 99% to 124% of integrated area intensity at 150 C) compared with the pristine one. The white LED devices using SB 0.3 PE as deep-blue-emitting component show good electronic properties, indicating that SB 0.3 PE is promising to be used in plant growth lighting, white LEDs, and other photoelectric applications.

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Section: Introductionmentioning

confidence: 99%

Pyrophosphate Phosphor Solid Solution with High Quantum Efficiency and Thermal Stability for Efficient LED Lighting

et al. 2020

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“…Especially, the high pure blue phosphor is necessary for backlit display. However, the commercially available blue phosphor such as BaMgAl 10 O 17 :Eu 2+ (BAM:Eu 2+ ) could not completely meet the color purity requirement of backlit display due to the broad fwhm . Another reported blue emitting phosphors have either unsuitable excitation position or broad emission band, which are also not extensively applied in backlit display.…”

Section: Introductionmentioning

confidence: 99%

Ultra‐narrow band blue emission of Eu²⁺ in halogenated (Alumino)borate systems based on high lattice symmetry

Wei

Cheng

et al. 2018

J Am Ceram Soc

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Phosphor materials with ultra-high color purity are highly desired in backlit display and WLEDs. How to achieve high-purity three-primary emission in rare earth ions activated inorganic phosphors has become a hot topic. Herein, we reported ultra-narrow band and highly efficient blue-violet-emitting Eu 2+ -doped Ba 2 B 5 O 9 X (fwhm = 31 nm) and NaBa 4 (AlB 4 O 9 ) 2 X 3 (X = Cl, Br) (fwhm = 43 nm) phosphors with peak positions around 424-437 nm. Especially, the color purity of Ba 2 B 5 O 9 Cl:Eu sample even exceeded 97%, its internal quantum efficiency could achieve 87%. The EXANES analysis revealed that the Eu mainly existed in the form of +2. According to the Rietveld structural refinement, extraordinarily narrow band emission should be attributed to the highly symmetric lattice structures with the flower-like polyhedrons in the studied (alumino)borate matrix. Significantly, the color gamut of as-prepared blue phosphor combined with the standard green and red phosphors was almost close to that of Rec. 2020 display standard. In addition, cation substitution strategy in NaBa 4 (Al x B 5-x O 9 ) 2 Cl 3 (x = 0-4) and NaBa 4 (Ga y B 5-y O 9 ) 2 Cl 3 (y = 0-3) samples successfully achieved spectra adjustment, and the underlying mechanism was proposed. All these results demonstrate that the as-prepared phosphors could be superior blue-emitting candidates for backlit display as well as WLEDs. K E Y W O R D Sblue emission, high symmetry, phosphors, ultra-narrow band, WLEDs

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“…In our previous work, it has been demonstrated that carbon coating deposited on the surface of BaMgAl 10 O 17 :Eu 2+ phosphors is an effective way to improve the intensity and thermal stability of oxide phosphors [22]. The carbon coated phosphors show a higher emission intensity and a better oxidation resistance at high temperature than uncoated phosphors.…”

Section: Introductionmentioning

confidence: 99%

Transition of Emission Colours as a Consequence of Heat-Treatment of Carbon Coated Ce3+-Doped YAG Phosphors

et al. 2017

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To modify the luminescence properties of Ce3+-doped Y3Al5O12 (YAG) phosphors, they have been coated with a carbon layer by chemical vapor deposition and subsequently heat-treated at high temperature under N2 atmosphere. Luminescence of the carbon coated YAG:Ce3+ phosphors has been investigated as a function of heat-treatment at 1500 and 1650 °C. The 540 nm emission intensity of C@YAG:Ce3+ is the highest when heated at 1650 °C, while a blue emission at 400–420 nm is observed when heated at 1500 °C but not at 1650 °C. It is verified by X-ray diffraction (XRD) that the intriguing luminescence changes are induced by the formation of new phases in C@YAG:Ce3+-1500 °C, which disappear in C@YAG:Ce3+-1650 °C. In order to understand the mechanisms responsible for the enhancement of YAG:Ce3+ emission and the presence of the blue emission observed for C@YAG:Ce3+-1500 °C, the samples have been investigated by a combination of several electron microscopy techniques, such as HRTEM, SEM-CL, and SEM-EDS. This local and cross-sectional analysis clearly reveals a gradual transformation of phase and morphology in heated C@YAG:Ce3+ phosphors, which is related to a reaction between C and YAG:Ce3+ in N2 atmosphere. Through reaction between the carbon layer and YAG host materials, the emission colour of the phosphors can be modified from yellow, white, and then back to yellow under UV excitation as a function of heat-treatment in N2 atmosphere.

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Enhanced Optical Performance of BaMgAl₁₀O₁₇:Eu²⁺ Phosphor by a Novel Method of Carbon Coating

Cited by 54 publications

References 31 publications

Pyrophosphate Phosphor Solid Solution with High Quantum Efficiency and Thermal Stability for Efficient LED Lighting

Pyrophosphate Phosphor Solid Solution with High Quantum Efficiency and Thermal Stability for Efficient LED Lighting

Ultra‐narrow band blue emission of Eu²⁺ in halogenated (Alumino)borate systems based on high lattice symmetry

Transition of Emission Colours as a Consequence of Heat-Treatment of Carbon Coated Ce3+-Doped YAG Phosphors

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Enhanced Optical Performance of BaMgAl10O17:Eu2+ Phosphor by a Novel Method of Carbon Coating

Cited by 54 publications

References 31 publications

Pyrophosphate Phosphor Solid Solution with High Quantum Efficiency and Thermal Stability for Efficient LED Lighting

Pyrophosphate Phosphor Solid Solution with High Quantum Efficiency and Thermal Stability for Efficient LED Lighting

Ultra‐narrow band blue emission of Eu2+ in halogenated (Alumino)borate systems based on high lattice symmetry

Transition of Emission Colours as a Consequence of Heat-Treatment of Carbon Coated Ce3+-Doped YAG Phosphors

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Enhanced Optical Performance of BaMgAl₁₀O₁₇:Eu²⁺ Phosphor by a Novel Method of Carbon Coating

Ultra‐narrow band blue emission of Eu²⁺ in halogenated (Alumino)borate systems based on high lattice symmetry