Optimized photoluminescence of red phosphor K2TiF6:Mn4+synthesized at room temperature and its formation mechanism

2015 ◽  
Vol 3 (9) ◽  
pp. 1935-1941 ◽  
Author(s):  
Lifen Lv ◽  
Zhen Chen ◽  
Guokui Liu ◽  
Shaoming Huang ◽  
Yuexiao Pan
Keyword(s):  
Formation Mechanism ◽  
Luminescence Intensity ◽  
Room Temperature ◽  
Synthetic Process ◽  
Red Phosphor ◽  
White Leds ◽  
Red Phosphors ◽  
Color Rendering

The formation mechanism for red phosphors K2TiF6:Mn4+synthesized at room temperature has been discussed. The luminescence intensity has been improved by optimizing the synthetic process. Encapsulation of the red phosphor K2TiF6:Mn4+with YAG:Ce on a GaN layer produces “warm” white LEDs with color rendering 86 at 3251 K.

A red phosphor BaTiF6:Mn4+: reaction mechanism, microstructures, optical properties, and applications for white LEDs

2014 ◽  
Vol 43 (25) ◽  
pp. 9414-9418 ◽  
Author(s):  
Xianyu Jiang ◽  
Zhen Chen ◽  
Shaoming Huang ◽  
Jiaguo Wang ◽  
Yuexiao Pan
Keyword(s):  
Optical Properties ◽  
Reaction Mechanism ◽  
White Light ◽  
Red Phosphor ◽  
White Leds ◽  
Red Phosphors ◽  
Warm White Light ◽  
Color Rendering Index ◽  
Color Rendering

Red phosphors BaTiF6:Mn4+ were obtained by etching Ti(OC4H9)4 and TiO2 with BaF2 in HF and a KMnO4 solution. The WLED fabricated with BaTiF6:Mn4+ exhibits a “warm” white light with a color rendering index of 93.13.

Improved luminescence properties of a novel red dodec-fluoride phosphor Ba3Sc2F12:Mn4+ with extraordinary thermal stability for WLED application

2020 ◽  
Vol 8 (18) ◽  
pp. 6299-6305
Author(s):  
Xinlong Dong ◽  
Yuexiao Pan ◽  
Yajun Jia ◽  
Rongjing Liu ◽  
Hongzhou Lian ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Luminescence Intensity ◽  
Room Temperature ◽  
Luminescence Properties ◽  
Red Phosphor ◽  
White Leds

A red phosphor, Ba3Sc2F12:Mn4+, with extraordinary thermal stability and for application in “warm” white LEDs for backlighting, was obtained at room temperature and its luminescence intensity has been improved by optimizing its synthetic parameters.

Room-temperature synthesis, controllable morphology and optical characteristics of narrow-band red phosphor K2LiGaF6:Mn4+

CrystEngComm ◽  
2018 ◽  
Vol 20 (15) ◽  
pp. 2183-2192 ◽  
Author(s):  
Haiming Cheng ◽  
Yan Song ◽  
Feng Hong ◽  
Guixia Liu ◽  
Dan Li ◽  
...  
Keyword(s):  
Room Temperature ◽  
Narrow Band ◽  
Color Temperature ◽  
Temperature Synthesis ◽  
Red Phosphor ◽  
Light Emitting ◽  
Yellow Phosphor ◽  
Red Phosphors ◽  
White Light Emitting Diodes ◽  
Color Rendering

The white light-emitting diodes fabricated by mixing GaN chips with yellow phosphor (Y3Al5O12:Ce3+) and red phosphors (K2LiGaF6:Mn4+) exhibit good performance with lower color temperature and higher color rendering index.

The formation mechanism, improved photoluminescence and LED applications of red phosphor K2SiF6:Mn4+

2014 ◽  
Vol 2 (20) ◽  
pp. 3879-3884 ◽  
Author(s):  
Lifen Lv ◽  
Xianyu Jiang ◽  
Shaoming Huang ◽  
Xi'an Chen ◽  
Yuexiao Pan
Keyword(s):  
Formation Mechanism ◽  
Manganese Oxides ◽  
Experimental Results ◽  
Red Phosphor ◽  
White Leds ◽  
Luminescence Efficiency

The formation mechanism of red phosphor K2SiF6:Mn4+ free of manganese oxides has been discussed based on detailed experimental results. Significant improvements in the luminescence efficiency make it a good candidate for applications in “warm” white LEDs.

Novel polygonal structure Mn4+ activated In3+-based Elpasolite-type hexafluorides red phosphor for warm white light-emitting diodes (WLEDs)

2019 ◽  
Vol 48 (4) ◽  
pp. 1376-1385 ◽  
Author(s):  
Feng Hong ◽  
Haiming Cheng ◽  
Chao Song ◽  
Guixia Liu ◽  
Wensheng Yu ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Synthetic Methods ◽  
Red Phosphor ◽  
Light Emitting ◽  
White Leds ◽  
Red Phosphors ◽  
Polygonal Structure ◽  
Warm White Light ◽  
White Light Emitting Diodes

Red phosphors (NH4)2NaInF6:Mn4+ with controllable morphology were synthesized via different synthetic methods, which can be fabricated for warm white LEDs.

A Promising Energy-Saving and Environmental-Friendly Lighting Device: High CRI White LED with Phosphor Materials

2016 ◽  
Vol 848 ◽  
pp. 446-453
Author(s):  
Sheng Liu ◽  
Bei Ying Zhou ◽  
Shi Jia Gu ◽  
Lian Jun Wang ◽  
Wan Jiang ◽  
...  
Keyword(s):  
Environmental Scanning Electron Microscopy ◽  
Luminescence Spectra ◽  
Environmental Scanning ◽  
X Ray Diffraction ◽  
Green Phosphor ◽  
Red Phosphor ◽  
White Leds ◽  
Phase Surface ◽  
Color Rendering ◽  
Fluorescence Spectrometer

Two kinds of commercial LED phosphors (green phosphor LuAG:Ce3+ and red phosphor CaAlSiN3:Eu2+) with polymethyl methacrylate (PMMA) powders were mixed to prepare film phosphors with tunable emission peak in photoluminescence spectrum by flat vulcanizing machine under the temperature of 170 oC and pressure of 2 MPa. The physical phase, surface morphology, transmittance, luminescence spectra of samples were characterized by means of X-ray diffraction (XRD), Environmental scanning electron microscopy (ESEM), Ultraviolet-Visible (UV-Vis) spectrophotometry and Fluorescence spectrometer. The results show that the film phosphors phase was consistent with raw phosphors, phosphor particles were uniformly distributed, and fluorescence spectra with different proportions of phosphors in different position can be adjusted. Tested by HSP 3000 spectrum analyzer, the white LEDs fabricated by blue chip and composite film phosphor containing 5 wt% green phosphor and 1.5 wt.% red phosphor, which refers to the remote excitation technique, possessed color coordinate of (0.3715, 0.3280) and color rendering index (CRI) of 87 when it was driven at power of 36 V/140 mA, reaching the international advanced level.

A novel inequivalent double-site substituted red phosphor Li4AlSbO6:Mn4+ with high color purity: Structure, photoluminescence properties, and application in warm white LEDs

2021 ◽  
Author(s):  
Zhiyuan Li ◽  
Xuhui Zhang ◽  
Ji Wu ◽  
Rui Guo ◽  
Lan Luo ◽  
...  
Keyword(s):  
Rare Earth ◽  
Spectral Properties ◽  
Light Emitting Diode ◽  
Color Purity ◽  
Photoluminescence Properties ◽  
Red Phosphor ◽  
Light Emitting ◽  
White Leds ◽  
Red Phosphors ◽  
High Color Purity

Non-rare-earth Mn4+-doped oxide red phosphors received increasing attention in the white light-emitting diode (LED) field for their admirable chemical stability and spectral properties. Here, a new inequivalent double-site substituted Mn4+-doped...

Optimizing and adjusting the photoluminescence of Mn4+-doped fluoride phosphors via forming composite particles

2019 ◽  
Vol 48 (2) ◽  
pp. 711-717 ◽  
Author(s):  
Yiwen Zhu ◽  
Shuo Yuan ◽  
Lin Huang ◽  
Yong Liu ◽  
Xinyue Li ◽  
...  
Keyword(s):  
Color Temperature ◽  
Composite Particles ◽  
White Leds ◽  
Red Phosphors ◽  
Color Rendering Index ◽  
Color Rendering

Nowadays, Mn4+-doped red phosphors are widely used in white LEDs to improve the color rendering index and decrease the correlated color temperature.

Synthesis and improved photoluminescence of hexagonal crystals of Li2ZrF6:Mn4+ for warm WLED application

2018 ◽  
Vol 47 (46) ◽  
pp. 16516-16523 ◽  
Author(s):  
Lei Zhang ◽  
Luqing Xi ◽  
Yuexiao Pan ◽  
Yajun Jia ◽  
Mingmei Wu ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Luminescence Intensity ◽  
Room Temperature ◽  
Exchange Method ◽  
Red Phosphor ◽  
Ion Exchange Method ◽  
First Time ◽  
Hexagonal Crystals

A novel red phosphor Li2ZrF6:Mn4+ being promising for application in WLEDs has been synthesized for the first time by the ion-exchange method at room temperature, and its luminescence intensity has been optimized.

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