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

Published on Feb 8, 2020in iScience
· DOI :10.1016/j.isci.2020.100892
Yuan Zhong7
Estimated H-index: 7
,
Mao Xia7
Estimated H-index: 7
+ 5 AuthorsZhi Zhou10
Estimated H-index: 10
Abstract
Summary 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 (Sr0.99-xBax)2P2O7:0.02Eu2+ (SBxPE x = 0-0.5) are developed. Upon the excitation at 350 nm, the optimized SB0.3PE 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 IQE (from 74% to 100%) and thermal stability (from 88% to 108% of peak intensity and 99% to 124% of integrated area intensity at 150°C) compared with the pristine one. The white LED devices using SB0.3PE as deep-blue-emitting component show good electronic properties, indicating that SB0.3PE is promising to be used in plant growth lighting, white LEDs and other photoelectric applications.
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References46
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#1Ming Zhao (USTB: University of Science and Technology Beijing)H-Index: 6
#2Hongxu Liao (USTB: University of Science and Technology Beijing)H-Index: 4
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Phosphor-converted white LEDs rely on combining a blue-emitting InGaN chip with yellow and red-emitting luminescent materials. The discovery of cyan-emitting (470–500 nm) phosphors is a challenge to compensate for the spectral gap and produce full-spectrum white light. Na0.5K0.5Li3SiO4:Eu2+ (NKLSO:Eu2+) phosphor was developed with impressive properties, providing cyan emission at 486 nm with a narrow full width at half maximum (FWHM) of only 20.7 nm, and good thermal stability with an integrated...
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#1Jianwei Qiao (SCUT: South China University of Technology)H-Index: 1
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Near-infrared luminescent materials exhibit unique photophysical properties that make them crucial components in photonic, optoelectronic and biological applications. As broadband near infrared phosphors activated by transition metal elements are already widely reported, there is a challenge for next-generation materials discovery by introducing rare earth activators with 4f-5d transition. Here, we report an unprecedented phosphor K3LuSi2O7:Eu2+ that gives an emission band centered at 740 nm wit...
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#1Yuan Zhong (HAU: Hunan Agricultural University)H-Index: 7
#2Shujie Gai (HAU: Hunan Agricultural University)H-Index: 2
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Abstract Mn 4+ activated Ca 14 Ga 10 Zn 6 O 35 (CGZO) have attracted much attention for the usages of white light-emitting-diodes (WLEDs), solar cells and plant growth LEDs. In this paper, we conducted chemical unit engineering in CGZO:Mn 4+ by substituting Ge 4+ -M + (M = Li, Na, K) for Ga 3+ -Ca 2+ . The impacts of Ge 4+ -M + (M = Li, Na, K) substitution on the crystal structure, photoluminescence properties, quantum efficiency (QE) and thermal stability were investigated systematically. With ...
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Summary The development of luminescence materials with long-lived upconversion (UC) phosphorescence and long luminescence rise edge (LRE) is a great challenge to advance the technology of photonics and materials sciences. The lanthanide ions-doped UC materials normally possess limited UC lifetime and short LRE, restricting direct afterglow viewing in visual images by the naked eye. Here, we show that the RbCaF3:Mn2+,Yb3+ UC luminescence material generates a long UC lifetime of ∼62 ms peaking at ...
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The authors are grateful to the University of St Andrews and EPSRC financial support (grants EP/P010482/1 and EP/M02105X/1). A.K.P thanks the Leverhulme Trust Early Career Fellowship (ECF-2017-326). I.D.W.S. acknowledges a Royal Society Wolfson Research Merit award.
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Exploring phosphors with high quantum efficiency (QE) and thermal stability is an important issue for their application in white light-emitting diodes (LEDs). In this work, the crystal structure and luminescent properties of Eu2+-activated aluminate phosphors with a normal composition (Ba0.8Eu0.2O)(Al2O3)4.575×(1+x) (short for BA1+xO:0.2Eu2+) were studied. Although the crystal structures of BA1+xO:0.2Eu2+ have a same space group, the increase of the Al content will lead to the decrease of cell v...
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