Obtaining Efficiently Tunable Red Emission in Ca3-δLnδWO6:Mn4+ (Ln = La, Gd, Y, Lu, δ = 0.1) Phosphors Derived from Nearly Nonluminescent Ca3WO6:Mn4+ via Ionic Substitution Engineering for Solid-State Lighting

2020 ◽  
Vol 8 (19) ◽  
pp. 7256-7261
Author(s):  
Kai Li ◽  
Rik Van Deun
Keyword(s):  
Solid State ◽  
Solid State Lighting ◽  
Red Emission ◽  
Ionic Substitution

Novel Mn4+-activated layered oxide-fluoride perovskite-type KNaMoO2F4 red phosphor for wide gamut warm white light-emitting diodes backlight

2021 ◽  
Author(s):  
Jiao Wu ◽  
Bo Wang ◽  
Zhiyuan Liu ◽  
Kang Zhang ◽  
Xiaoshuang Li ◽  
...  
Keyword(s):  
Solid State ◽  
White Light ◽  
Light Emitting Diodes ◽  
Solid State Lighting ◽  
Red Phosphor ◽  
Red Emission ◽  
Light Emitting ◽  
Warm White Light ◽  
White Light Emitting Diodes ◽  
Perovskite Type

Mn4+-activated oxidefluoride phosphors are attractive for application in wide solid-state lighting devices because of its distinct red emission at about 630 nm and the abundant storage of Mn4+ ion. However,...

scholarly journals Excitation-Independent Emission of Carbon Quantum Dot Solids

2020 ◽  
Vol 2020 ◽  
pp. 1-5
Author(s):  
Xuan-Dung Mai ◽  
Yen Thi Hai Phan ◽  
Van-Quang Nguyen
Keyword(s):  
Solid State ◽  
Solvothermal Method ◽  
Blue Emission ◽  
Carbon Quantum Dots ◽  
Solid State Lighting ◽  
Optical And Electrical Properties ◽  
Red Emission ◽  
Solid Films ◽  
Carbon Quantum Dot ◽  
S States

Solid assemblies of carbon quantum dots (CQDs) are important for diverse applications including LEDs, solar cells, and photosensors; their optical and electrical properties have not been explored yet. Herein, we used amphiphilic CQDs synthesized from citric acid and thiourea by a solvothermal method to fabricate CQD solid films. Optical properties of CQDs studied by UV-Vis and photoluminescence spectroscopies indicate that CQDs possess three different emission centers at 425 nm, 525 nm, and 625 nm originating from C sp2 states, N-states, and S-states, respectively. In a solid state, π-π stacking quenched the blue emission, while the red emission increased. Importantly, CQD films exhibited excitation independence, which is important to design solid-state lighting applications.

Blue Upconversion Luminescence from Phosphor Tm3+/Yb3+ Co-Doped Gd2Mo3O9

2013 ◽  
Vol 683 ◽  
pp. 3-6
Author(s):  
Jia Yue Sun ◽  
Bing Xue ◽  
Guang Chao Sun ◽  
Dian Peng Cui ◽  
Hai Yan Du
Keyword(s):  
Solid State ◽  
Upconversion Luminescence ◽  
Blue Emission ◽  
Solid State Reaction Method ◽  
Solid State Lighting ◽  
Red Emission ◽  
Reaction Method ◽  
X Ray ◽  
Strong Blue Emission ◽  
Co Doped

The upconversion (UC) luminescence properties of phosphor Tm3+/Yb3+co-doped Gd2Mo3O9were investigated in detail. Tm3+/Yb3+co-doped Gd2Mo3O9was prepared by solid-state reaction method using Na2CO3as flux and characterized by powder X-ray diffractometry. Under 980nm excitation, Tm3+/Yb3+co-doped Gd2Mo3O9has exhibited a weak red emission near 651nm and strong blue emission at 476nm. Tm3+/Yb3+co-doped Gd2Mo3O9phosphor has been considered as a better candidate in solid-state lighting applications.

Spectroscopic behavior of Eu3+ in SnO2 for tunable red emission in solid state lighting devices

RSC Advances ◽  
2015 ◽  
Vol 5 (63) ◽  
pp. 51102-51109 ◽  
Author(s):  
M. Chowdhury ◽  
S. K. Sharma
Keyword(s):  
Solid State ◽  
Spectroscopic Investigation ◽  
Solid State Lighting ◽  
Red Emission ◽  
Spectroscopic Behavior

This paper reports a spectroscopic investigation of Eu3+ doped SnO2 nanoparticles.

scholarly journals Effect of Eu3+Concentration on the Luminescent Properties of SrTiO3Phosphors Prepared by Pressure-Assisted Combustion Synthesis

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
C. R. García ◽  
J. Oliva ◽  
M. T. Romero ◽  
R. Ochoa-Valiente ◽  
L. A. Garcia Trujillo
Keyword(s):  
Solid State ◽  
Combustion Synthesis ◽  
Luminescent Properties ◽  
Solid State Lighting ◽  
Sem Images ◽  
Red Emission ◽  
Red Phosphors ◽  
Field Emission Displays ◽  
Potential Applications

This work presents the structural, morphological, and luminescent characterization of pure SrTiO3and SrTiO3:Eu3+powders doped with different europium atomic concentrations from 3.0 to 7.0 a.t.%. Those phosphors were prepared by pressure-assisted combustion synthesis using titanium oxide as precursor and were subjected to postannealing at 1200°C. XRD measurements indicated that undoped and Eu3+doped samples presented a single cubic crystalline phase and SEM images demonstrated that we have particles with sizes in the range of 0.2 µm–1.0 µm. Moreover, the size of the grains increases as the content of Eu3+dopant increases. A strong red emission from Eu3+ions was obtained by photoluminescence under excitation at 396 nm and confirmed by cathodoluminescence. All those results indicate that our red phosphors could be useful for potential applications in solid state lighting and field emission displays.

Red-emitting phosphors APF6:Mn4+ (A = Cs+, Rb+, K+): synthesis, luminescence properties and application in solid-state lighting

2019 ◽  
Vol 48 (29) ◽  
pp. 10901-10906 ◽  
Author(s):  
Yu Chen ◽  
Zhaofeng Yang ◽  
Qin Wang ◽  
Meizhu Rong ◽  
Qiang Zhou ◽  
...  
Keyword(s):  
Solid State ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Thermal Quenching ◽  
Solid State Lighting ◽  
Luminescence Properties ◽  
Red Emission ◽  
White Leds

New red-emitting phosphors APF6:Mn4+ (A = Cs+, Rb+, K+) show intense red emission with high external quantum efficiency and thermal quenching resistance for warm white LEDs.

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.

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