Deep red emission in Eu2+-activated Sr4(PO4)2O phosphors for blue-pumped white LEDs

2015 ◽  
Vol 3 (28) ◽  
pp. 7356-7362 ◽  
Author(s):  
Naoyuki Komuro ◽  
Masayoshi Mikami ◽  
Paul J. Saines ◽  
Katsuhiro Akimoto ◽  
Anthony K. Cheetham
Keyword(s):  
Excitation Peak ◽  
Red Phosphor ◽  
Red Emission ◽  
Blue Led ◽  
White Leds

The deep red phosphor Sr4(PO4)2O:Eu2+, which has an excitation peak around 450 nm for blue LED applications, is reported.

Host sensitized novel red phosphor CaZrSi2O7 : Eu3+for near UV and blue LED-based white LEDs

2010 ◽  
Vol 43 (39) ◽  
pp. 395103 ◽  
Author(s):  
Vengala Rao Bandi ◽  
M Jayasimhadri ◽  
Junho jeong ◽  
Kiwan Jang ◽  
Ho Sueb Lee ◽  
...  
Keyword(s):  
Red Phosphor ◽  
Blue Led ◽  
White Leds

Multi-peaked broad-band red phosphor Y3Si6N11:Pr3+ for white LEDs and temperature sensing

2020 ◽  
Vol 49 (48) ◽  
pp. 17779-17785
Author(s):  
Dashuai Sun ◽  
Liangliang Zhang ◽  
Zhendong Hao ◽  
Hao Wu ◽  
Huajun Wu ◽  
...  
Keyword(s):  
Broad Band ◽  
Temperature Sensing ◽  
Red Phosphor ◽  
Red Emission ◽  
White Leds

The origin of multi-peaked broad-band red emission of the Y3Si6N11:Pr3+ phosphor and its application in WLED and temperature sensing.

Synthesis of Sr2Si5N8:Eu2+ Phosphor for Enhanced Red Emission

2011 ◽  
Vol 233-235 ◽  
pp. 2705-2709 ◽  
Author(s):  
Van Duong Luong ◽  
Wen Tao Zhang ◽  
Hong Ro Lee
Keyword(s):  
Single Phase ◽  
Luminescence Properties ◽  
Heating Process ◽  
X Ray Diffraction ◽  
Red Phosphor ◽  
Red Emission ◽  
Light Emitting ◽  
White Leds ◽  
Xrd Patterns ◽  
White Light Emitting Diodes

For removing impurities to improve luminescence properties, Eu2+- activated Sr2Si5N8 red phosphor for white light-emitting diodes (LEDs) was prepared by multiple heat-treatment synthesis which includes carbothermal reduction and nitridation. The X-ray diffraction (XRD) patterns were showed the standard single phase of Sr2Si5N8. With an optimized amount of Eu2+ (2 at. %) dopant, the broad excitation band of Sr2Si5N8:Eu2+ indicated that the phosphor was suitable for application of white LEDs with UV or blue chip, and red emission peak at 628 nm in spectra originating from the 4f65d1→4f7 transition of Eu2+ ion. After third heating process, luminescence properties of the obtained phosphor were improved obviously and higher than commercial YAG:Ce3+ phosphor.

A novel double-perovskite Gd2ZnTiO6:Mn4+red phosphor for UV-based w-LEDs: structure and luminescence properties

2016 ◽  
Vol 4 (12) ◽  
pp. 2374-2381 ◽  
Author(s):  
Hui Chen ◽  
Hang Lin ◽  
Qingming Huang ◽  
Feng Huang ◽  
Ju Xu ◽  
...  
Keyword(s):  
Double Perovskite ◽  
Luminescence Properties ◽  
Red Phosphor ◽  
White Leds

This work highlights a novel double-perovskite red phosphor Gd2ZnTiO6:Mn4+for UV-based warm white LEDs.

Growth and Light Properties of Fluorescent SiC for White LEDs

2012 ◽  
Vol 717-720 ◽  
pp. 87-92
Author(s):  
Mikael Syväjärvi ◽  
Rositza Yakimova ◽  
Motoaki Iwaya ◽  
Tetsuya Takeuchi ◽  
Isamu Akasaki ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
White Light ◽  
Energy Savings ◽  
Red Light ◽  
Visible Range ◽  
White Led ◽  
Light Emitting ◽  
Blue Led ◽  
White Leds ◽  
New Type

The LED technology started to developed many years ago with red light emitting diodes. To achieve the blue LED, novel growth technologies and process steps were explored, and made it possible to demonstrate efficient blue LED performance from nitrides. The efficiency was further developed and blue LEDs were commercially introduced in the 1990’s. The white LED became possible by the use of the blue LED and a phosphor that converts a part of the blue light to other colors in the visible range to combine into white light. However, even today there are limitations in the phosphor-based white LED technology, in particular for general lighting, and new solutions should be explored to speed the pace when white LEDs will be able to make substantial energy savings. In this paper we overview gallium nitride materials evolution and growth concepts for LEDs. We describe the fluorescent silicon carbide material prepared by a novel growth technology for a new type of white LED in general lighting with pure white light. This paper introduces an interesting research in fundamental growth and optical properties of light emitting silicon carbide.

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.

Optimized photoluminescence of red phosphor Na2 SnF6 :Mn4+ as red phosphor in the application in “warm” white LEDs

2017 ◽  
Vol 100 (5) ◽  
pp. 2005-2015 ◽  
Author(s):  
Luqing Xi ◽  
Yuexiao Pan ◽  
Xian Chen ◽  
Shaoming Huang ◽  
Mingmei Wu
Keyword(s):  
Red Phosphor ◽  
White Leds

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,...

Synthesis and luminescence properties of CaLaMgNbO6:Mn4+ red phosphor for UV-based w-LEDs

2019 ◽  
Vol 33 (34) ◽  
pp. 1950426
Author(s):  
Lei Shi ◽  
Ya-Jie Han ◽  
Shuang Wang ◽  
Zhi-Xin Ji ◽  
Meng Sun ◽  
...  
Keyword(s):  
Dipole Interaction ◽  
Solid State Method ◽  
Excitation Peak ◽  
Red Phosphor ◽  
Light Emitting ◽  
Good Thermal Stability ◽  
Level Transition ◽  
White Light Emitting Diodes ◽  
Traditional Solid State Method ◽  
Optimum Doping Concentration

A series of [Formula: see text] ([Formula: see text] = 0.0005, 0.001, 0.003, 0.005, 0.007, 0.009) phosphors were prepared by traditional solid-state method at high temperature. The structure and morphology of the samples were analyzed. The results showed that the prepared [Formula: see text] [Formula: see text] phosphors were uniformly dispersed and the particle size was less than 5 [Formula: see text]m. [Formula: see text] phosphors have the strongest excitation peak at 351 nm, which is caused by the [Formula: see text] transition of [Formula: see text] ions. The strongest emission peak is at 697 nm, which is due to the [Formula: see text] level transition of [Formula: see text]. The optimum doping concentration is 0.5 mol.% and the mechanism of concentration quenching is the dipole–dipole interaction between [Formula: see text] ions. Importantly, [Formula: see text] sample has good thermal stability ([Formula: see text]/[Formula: see text] = 48.3%). In addition, the color coordinates of all samples were concentrated in the far-red region (0.733, 0.267). The above results indicate that [Formula: see text] sample has potential application value in the field of white light-emitting diodes ([Formula: see text]-LEDs).

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