A novel red phosphor of Mn4+ion-doped oxyfluoroniobate BaNbOF5for warm WLED applications

CrystEngComm ◽  
2018 ◽  
Vol 20 (37) ◽  
pp. 5641-5646 ◽  
Author(s):  
Xinlong Dong ◽  
Yuexiao Pan ◽  
Dong Li ◽  
Hongzhou Lian ◽  
Jun Lin
Keyword(s):  
Blue Light ◽  
Room Temperature ◽  
Prepared Phosphor ◽  
Color Purity ◽  
Red Phosphor ◽  
Light Region ◽  
Intense Absorption ◽  
Red Luminescence

A novel red phosphor composed of Mn4+-activated oxyfluoroniobate BaNbOF5was obtained at room temperature in air. The as-prepared phosphor showed a broad and intense absorption in the blue-light region and a bright red luminescence with a color purity of 97.7%.

scholarly journals Deep-red emitting Mg2TiO4:Mn4+ phosphor ceramics for plant lighting

2020 ◽  
Author(s):  
Zixin Wang ◽  
Hui LIN ◽  
Dawei Zhang ◽  
Yiming Shen ◽  
Yang Li ◽  
...  
Keyword(s):  
Blue Light ◽  
Room Temperature ◽  
Solid State Reaction Method ◽  
Peak Wavelength ◽  
Blue Led ◽  
Crystal Field Strength ◽  
Light Region ◽  
Racah Parameters ◽  
Order Of Magnitude ◽  
Narrow Emission

Abstract In this study, deep red emitting Mg2TiO4:Mn4+ phosphor ceramics were synthesized by the high temperature solid-state reaction method. The ceramics can be excited by the 465 nm blue light and had a narrow emission with a full width at half maximum (FWMH) value of 31 nm. The peak wavelength was located at 658 nm, which matched the most efficient wavelength for photosynthesis. The crystal field strength (Dq) and the Racah parameters (B and C) are estimated by Tanabe-Sugano diagram. The thermal conductivity of the ceramics was 7.535 W/(m·K) at room temperature, which was one order of magnitude higher than that of the traditional packaging method using silicone gel. A set of phosphor converted LEDs were fabricated by mounting the phosphor ceramics onto the 460 nm blue LED chips and the CIE coordinates can move from the blue light region to the purple light region with the thickness of the ceramic increasing. These results indicated that the Mg2TiO4:Mn4+ phosphor ceramic was suitable for plant lighting when combined with a blue LED chip.

Room-temperature synthesis and warm-white LED applications of Mn4+ ion doped fluoroaluminate red phosphor Na3AlF6:Mn4+

2016 ◽  
Vol 4 (13) ◽  
pp. 2480-2487 ◽  
Author(s):  
E. H. Song ◽  
J. Q. Wang ◽  
S. Ye ◽  
X. F. Jiang ◽  
M. Y. Peng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Room Temperature ◽  
White Led ◽  
Color Purity ◽  
Step Method ◽  
Temperature Synthesis ◽  
Red Phosphor ◽  
Room Temperature Synthesis ◽  
Good Thermal Stability ◽  
High Color Purity

An intense red fluoroaluminate phosphor, cryolite Na3AlF6:Mn4+, with high color purity and good thermal stability has been designed and synthesized via a facile two-step method at room temperature.

scholarly journals Device Modeling of Quantum Dot–Organic Light Emitting Diodes for High Green Color Purity

2021 ◽  
Vol 11 (6) ◽  
pp. 2828
Author(s):  
Byoung-Seong Jeong
Keyword(s):  
Quantum Dot ◽  
Emission Spectrum ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Color Purity ◽  
Wavelength Band ◽  
Light Emitting ◽  
Green Color ◽  
Organic Light

In this study, the optimal structure for obtaining high green color purity was investigated by modeling quantum dot (QD)–organic light-emitting diodes (OLED). It was found that even if the green quantum dot (G-QD) density in the G-QD layer was 30%, the full width at half maximum (FWHM) in the green wavelength band could be minimized to achieve a sharp emission spectrum, but it was difficult to completely block the blue light leakage with the G-QD layer alone. This blue light leakage problem was solved by stacking a green color filter (G-CF) layer on top of the G-QD layer. When G-CF thickness 5 μm was stacked, blue light leakage was blocked completely, and the FWHM of the emission spectrum in the green wavelength band was minimized, resulting in high green color purity. It is expected that the overall color gamut of QD-OLED can be improved by optimizing the device that shows such excellent green color purity.

Blue Light Driven Free-Radical Polymerization using Arylazo Sulfones as Initiators

2021 ◽  
Author(s):  
Andrea Nitti ◽  
Angelo Martinelli ◽  
Fabrice Batteux ◽  
Stefano Protti ◽  
Maurizio Fagnoni ◽  
...  
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Radical Polymerization ◽  
Blue Light ◽  
Room Temperature ◽  
Free Radical Polymerization

The polymerization of a broad range of electron-poor olefins has been achieved under free-radical conditions by using arylazo sulfones as visible light photoinitiators. The process proceeds smoothly at room temperature...

Blue‐Light‐Absorbing Thin Films Showing Ultralong Room‐Temperature Phosphorescence

2019 ◽  
Vol 31 (12) ◽  
pp. 1807887 ◽  
Author(s):  
Marine Louis ◽  
Heidi Thomas ◽  
Max Gmelch ◽  
Anna Haft ◽  
Felix Fries ◽  
...  
Keyword(s):  
Thin Films ◽  
Blue Light ◽  
Room Temperature ◽  
Room Temperature Phosphorescence

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.

Fabrication of Macroporous Silicon in Organic Electrolytes and their Luminescence

2017 ◽  
Vol 748 ◽  
pp. 127-131 ◽  
Author(s):  
Wu Lin Li ◽  
Wen Jing Yang ◽  
Mei Long ◽  
Gen Rong Li ◽  
Yan Ma ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Room Temperature ◽  
Electrochemical Process ◽  
Macroporous Silicon ◽  
Organic Solution ◽  
Organic Electrolytes ◽  
Red Luminescence ◽  
Organic Solutions ◽  
Side Illumination ◽  
Nanoporous Layer

The quasi-regular arrangements porous silicon was fabricated by by electrochemical process using organic solutions with front-side illumination, and SEM showed that the morphology of porous silicon was dependent sensitively on the current density, organic electrolytes and their concentration. The results indicate that N-dimethylformamide (DMF) is the best organic solution and quasi-regular arranged pores can be well organized in 20%HF/DMF solution. The luminescence shows fresh porous silicon can emit the red luminescence at room temperature and quench after nanoporous layer destroyed.

Room-temperature synthesis and optimized photoluminescence of a novel red phosphor NaKSnF6:Mn4+for application in warm WLEDs

2017 ◽  
Vol 5 (36) ◽  
pp. 9255-9263 ◽  
Author(s):  
Luqing Xi ◽  
Yuexiao Pan ◽  
Mengmeng Zhu ◽  
Hongzhou Lian ◽  
Jun Lin
Keyword(s):  
Room Temperature ◽  
Temperature Synthesis ◽  
Red Phosphor ◽  
Room Temperature Synthesis ◽  
Chromaticity Coordinates ◽  
Cie Coordinates

A novel red fluoride phosphor NKSF:Mn was obtained at room temperature by controlling the ratio of NaF to KF. The chromaticity coordinates of phosphor NKSF:Mn are very close to the CIE coordinates of ideal red ascribed to the contribution of particularly strong zero-phonon lines.

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