Crystal structure, photoluminescence and afterglow properties of red-emitting phosphors Ca4Nb2O9:Pr3+ for AC-LEDs

2021 ◽  
Vol 45 (1) ◽  
pp. 66-75 ◽  
Author(s):  
Pengfei Zhang ◽  
Na Li ◽  
Zhiting Wei ◽  
Ziqi Wang ◽  
Mengwei Gou ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Blue Light ◽  
Red Emission ◽  
Light Excitation ◽  
Time Gap

A novel Ca4Nb2O9:Pr3+ short-afterglow phosphor exhibits efficient red emission under blue light excitation, which can be used to compensate the time gap of AC-LEDs.

A highly-efficient blue-light excitable red phosphor: intramolecular π-stacking interactions in one dinuclear europium(iii) complex

2016 ◽  
Vol 45 (7) ◽  
pp. 2839-2844 ◽  
Author(s):  
Zhengliang Wang ◽  
Hui Yang ◽  
Pei He ◽  
Yonghui He ◽  
Jishou Zhao ◽  
...  
Keyword(s):  
Blue Light ◽  
Stacking Interactions ◽  
Red Phosphor ◽  
Red Emission ◽  
Highly Efficient ◽  
Π Stacking ◽  
Light Excitation

The europium(iii) complex [Eu2(2,7-BTFDBC)(DBM)4(Phen)2] with multiple T-shaped and parallel-displaced π-stacking interactions exhibits intense red emission under blue light excitation with high colour purity.

Blue-light-excited narrowing red photoluminescence in lead-free double perovskite Cs2−xKxAg0.6Na0.4In0.8Bi0.2Cl6−xBrx with cryogenic effects

2021 ◽  
Author(s):  
Xiao-Kai Gong ◽  
Xiao-Song Zhang ◽  
Lan Li ◽  
Jian-Ping Xu ◽  
Ru-Kun Ding ◽  
...  
Keyword(s):  
Blue Light ◽  
Low Temperatures ◽  
Double Perovskite ◽  
Lead Free ◽  
Red Emission ◽  
Transition Mode ◽  
Light Excitation

The addition of KBr changed the original transition mode of the material and realized the blue-light excitation and narrow red emission of Cs2AgInCl6 at low temperatures.

A new red phosphor BaGeF6:Mn4+: hydrothermal synthesis, photo-luminescence properties, and its application in warm white LED devices

2015 ◽  
Vol 3 (13) ◽  
pp. 3055-3059 ◽  
Author(s):  
Qiang Zhou ◽  
Yayun Zhou ◽  
Yong Liu ◽  
Lijun Luo ◽  
Zhengliang Wang ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Blue Light ◽  
Photo Luminescence ◽  
Luminescence Properties ◽  
White Led ◽  
Hydrothermal Route ◽  
Red Phosphor ◽  
Red Emission ◽  
Light Excitation

A new red phosphor BaGeF6:Mn4+prepared by a hydrothermal route shows intense red emission under blue light excitation, which may find application in warm white LED devices.

Novel red-emitting phosphors A2HfF6:Mn4+(A = Rb+, Cs+) for solid-state lighting

2017 ◽  
Vol 46 (29) ◽  
pp. 9451-9456 ◽  
Author(s):  
Zhaofeng Yang ◽  
Qianwen Wei ◽  
Meizhu Rong ◽  
Zhiyu Yang ◽  
Zhengliang Wang ◽  
...  
Keyword(s):  
Solid State ◽  
Blue Light ◽  
Potential Application ◽  
Solid State Lighting ◽  
Red Emission ◽  
Regular Octahedron ◽  
Light Excitation

New red-emitting phosphors A2HfF6(A = Rb+, Cs+) doped with Mn4+located at the center of a regular octahedron show intense red emission under blue light excitation and find potential application in LED chips.

Site‐Selective Occupancy of Eu 2+ Toward Blue‐Light‐Excited Red Emission in a Rb 3 YSi 2 O 7 :Eu Phosphor

2019 ◽  
Vol 58 (33) ◽  
pp. 11521-11526 ◽  
Author(s):  
Jianwei Qiao ◽  
Lixin Ning ◽  
Maxim S. Molokeev ◽  
Yu‐Chun Chuang ◽  
Qinyuan Zhang ◽  
...  
Keyword(s):  
Blue Light ◽  
Red Emission ◽  
Site Selective

scholarly journals Single Crystal Growth and Crystal Structure Analysis of Novel Orange-Red Emission Pure Nitride CaAl2Si4N8:Eu2+ Phosphor

ACS Omega ◽  
2019 ◽  
Vol 4 (6) ◽  
pp. 9939-9945 ◽  
Author(s):  
Shota Hasegawa ◽  
Takuya Hasegawa ◽  
Sun Woog Kim ◽  
Ryota Yamanashi ◽  
Kazuyoshi Uematsu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Crystal Growth ◽  
Single Crystal ◽  
Structure Analysis ◽  
Single Crystal Growth ◽  
Crystal Structure Analysis ◽  
Red Emission

scholarly journals Fluorescence distribution pattern allows to distinguish two species of Eugymnanthea (Leptomedusae: Eirenidae)

2008 ◽  
Vol 88 (8) ◽  
pp. 1743-1746 ◽  
Author(s):  
Shin Kubota ◽  
Patrizia Pagliara ◽  
Cinzia Gravili
Keyword(s):  
Distribution Pattern ◽  
Blue Light ◽  
Biological Significance ◽  
Distribution Patterns ◽  
Taxonomic Character ◽  
Green Fluorescence ◽  
Short Life ◽  
Fluorescent Microscope ◽  
Light Excitation ◽  
Auto Fluorescence

The auto-fluorescence patterns of the medusae observed under a fluorescent microscope with blue light excitation allows to distinguish two species of Eugymnanthea, this even when they are still attached to the hydroid as small medusa buds despite the occurrence of a sex-dependant pattern in E. japonica. A total of four distribution patterns of green fluorescence, including non-fluorescence, could be found. Three of them are found in E. japonica, called ‘subumbrellar fluorescence type’ except for non-fluorescence, while another type is found in E. inquilina, called ‘umbrellar margin fluorescence type’. During the short life of the medusa the latter type remained invariable for up to six days in E. inquilina, while the pattern observed for up to seven days in E. japonica changed sometimes, but it always remained distinguishable from the pattern found in E. inquilina. Therefore, the fluorescence pattern is a reliable taxonomic character. Fluorescence was not found in unfertilized eggs, planulae 2–8 days old, parthenogenetically produced larvae, or in the hydroids of the two species. The auto-fluorescent and possible bioluminescent tissues of these Eugymnanthea medusae could have some unknown biological significance.

K3Eu5(PO4)6: hydrothermal synthesis, crystal structure and photoluminescence properties

2019 ◽  
Vol 75 (7) ◽  
pp. 883-890 ◽  
Author(s):  
Ya-Li Xue ◽  
Ai-Yun Zhang ◽  
Xiao-Yang Han ◽  
Xiao-Qi Cui ◽  
Ling Deng ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrothermal Synthesis ◽  
Uv Light ◽  
Three Dimensional ◽  
Visible Region ◽  
Monoclinic Space Group ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Strong Luminescence ◽  
Light Excitation

An anhydrous orthophosphate, K3Eu5(PO4)6 (tripotassium pentaeuropium hexaphosphate), has been prepared by a high-temperature solid-state reaction combined with hydrothermal synthesis, and its crystal structure was determined by single-crystal X-ray diffraction analysis (SC-XRD). The results show that the compound crystallizes in the monoclinic space group C2/c and the structure features a three-dimensional framework of [Eu5(PO4)6]∞, with the tunnel filled by K+ ions. The IR spectrum, UV–Vis spectrum and luminescence properties of polycrystalline samples of K3Eu5(PO4)6, annealed at temperatures of 650, 700, 750, 800 and 850 °C, were investigated. Although with a full Eu3+ concentration (9.96 × 1021 ions cm−3), the self-activated phosphor K3Eu5(PO4)6 shows s strong luminescence emission intensity with a quantum yield of 37%. Under near-UV light excitation (393 nm), the series of samples shows the characteristic emissions of Eu3+ ions in the visible region from 575 to 715 nm. The sample sintered at 800 °C gives the strongest emission and its lifetime sintered at 800 °C (1.88 ms) is also the longest of all.

scholarly journals Novel Tunable Green-Red Luminescence in Mn2+ Doped Ca9Tb(PO4)7 Phosphors Based on the Mn2+ Regulation and Energy Transfer

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 952
Author(s):  
Bingwen Yang ◽  
Yefeng Feng ◽  
Qinghu Zhao ◽  
Miao He ◽  
Yang Lv
Keyword(s):  
Energy Transfer ◽  
Green Emission ◽  
Energy Transfer Mechanism ◽  
Red Emission ◽  
Broadband Emission ◽  
Characteristic Emission ◽  
Potential Applications ◽  
Light Excitation ◽  
Red Luminescence ◽  
Thermal Stability Of

β-Ca3(PO4)2 type phosphors Ca9Tb(PO4)7:Mn2+ were fabricated by high temperature solid state reaction. Under 377 nm light excitation, the Ca9Tb(PO4)7 host displays the green emission attributable to the characteristic emission of Tb3+ ions peaking at 488, 542, 586, and 620 nm, respectively. The red broadband emission is observed when Ca9Tb(PO4)7 is doped with Mn2+ ions. The emission is attributed to the energy transfer from Tb3+ to Mn2+ ions; this facilitates the realization of the tunable green–red emission. The energy transfer mechanism from Tb3+ to Mn2+ is defined as quadrupole–quadrupole interaction. Furthermore, the thermal stability of Ca9Tb(PO4)7:Mn2+ samples has been studied, and it can maintain half the emission intensity exceeding 424 K. This demonstrates their potential applications in white light LEDs (w-LEDs).

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