An efficient and stable narrow band Mn4+-activated fluorotitanate red phosphor Rb2TiF6:Mn4+ for warm white LED applications

2018 ◽  
Vol 6 (32) ◽  
pp. 8670-8678 ◽  
Author(s):  
L. Y. Wang ◽  
E. H. Song ◽  
Y. Y. Zhou ◽  
T. T. Deng ◽  
S. Ye ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Quantum Efficiency ◽  
Working Conditions ◽  
Narrow Band ◽  
Internal Quantum Efficiency ◽  
Luminescence Properties ◽  
White Led ◽  
Red Phosphor ◽  
Red Emitting Phosphor

A Rb-based fluorotitanate red-emitting phosphor Rb2TiF6:MnM4+ with an internal quantum efficiency of 91% was synthesized and presents exceptional luminescence properties, thermal stability and longevity under LED working conditions.

Synthesis and warm-white LED applications of an efficient narrow-band red emitting phosphor, Rb2ZrF6:Mn4+

2017 ◽  
Vol 5 (29) ◽  
pp. 7253-7261 ◽  
Author(s):  
L. Y. Wang ◽  
E. H. Song ◽  
Y. Y. Zhou ◽  
T. T. Deng ◽  
S. Ye ◽  
...  
Keyword(s):  
Narrow Band ◽  
Precipitation Method ◽  
White Led ◽  
Red Phosphor ◽  
Yellow Phosphor ◽  
Co Precipitation ◽  
Red Emitting Phosphor

Phosphor Rb2ZrF6:Mn4+has been synthesizedviaa co-precipitation method. Series of WLEDs were fabricated by combining YAG:Ce3+yellow phosphor and different amount of Rb2ZrF6:Mn4+red phosphor with InGaN blue chips.

Rare earth-free high color rendering white light-emitting diodes using CsVO3 with highest quantum efficiency for vanadate phosphors

2015 ◽  
Vol 3 (41) ◽  
pp. 10748-10754 ◽  
Author(s):  
Tomohiko Nakajima ◽  
Masahiko Isobe ◽  
Yuko Uzawa ◽  
Tetsuo Tsuchiya
Keyword(s):  
Rare Earth ◽  
Quantum Efficiency ◽  
Internal Quantum Efficiency ◽  
White Led ◽  
Red Phosphor ◽  
Light Emitting ◽  
Color Rendering Index ◽  
White Light Emitting Diodes ◽  
Color Rendering ◽  
Very High

Internal quantum efficiency of CsVO3 was considerably enhanced up to 95.8%, and a rare earth free white LED that had a very high color rendering index of 91.1 was realized by using CsVO3 and a deep red phosphor Mg2TiO4:Mn4+.

scholarly journals Thermally stable La2LiSbO6:Mn4+,Mg2+far-red emitting phosphors with over 90% internal quantum efficiency for plant growth LEDs

RSC Advances ◽  
2018 ◽  
Vol 8 (56) ◽  
pp. 31835-31842 ◽  
Author(s):  
Liangling Sun ◽  
Balaji Devakumar ◽  
Jia Liang ◽  
Bin Li ◽  
Shaoying Wang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Plant Growth ◽  
Quantum Efficiency ◽  
Internal Quantum Efficiency ◽  
Double Perovskite ◽  
Thermally Stable ◽  
Good Thermal Stability

Double perovskite La2LiSbO6:Mn4+,Mg2+far-red emitting phosphors with internal quantum efficiency as high as 92% and good thermal stability were developed for plant growth LEDs.

Luminescence properties of Mn4+ with high 2Eg level energy in the polyfluoride Na3Li3Sc2F12

2020 ◽  
Vol 49 (33) ◽  
pp. 11613-11617
Author(s):  
Hong Li ◽  
Yan Liu ◽  
Shu Tang ◽  
Lijun Luo ◽  
Qiang Zhou ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Thermal Quenching ◽  
Luminescence Properties ◽  
Level Energy ◽  
Red Emission ◽  
White Leds ◽  
Red Emitting Phosphor

Red-emitting phosphor Na3Li3Sc2F12:Mn4+ with the high 2Eg level energy shows intensive red emission accompanied with the high external quantum efficiency and thermal-quenching resistance for warm white LEDs.

Thickness-dependent internal quantum efficiency of narrow band-gap polymer-based solar cells

2015 ◽  
Vol 143 ◽  
pp. 242-249 ◽  
Author(s):  
Hoon Park ◽  
Jongdeok An ◽  
Jongwoo Song ◽  
Myounghee Lee ◽  
Hyuntak Ahn ◽  
...  
Keyword(s):  
Solar Cells ◽  
Band Gap ◽  
Quantum Efficiency ◽  
Narrow Band ◽  
Internal Quantum Efficiency

Synthesis and Photoluminescence Properties of Sc0.88-xLu0.05VO4:Eu3+0.07,Bi3+x Red Phosphor

2017 ◽  
Vol 727 ◽  
pp. 604-611
Author(s):  
Di Wu ◽  
Xin Yu Ye ◽  
Xin Hua Yang ◽  
Jian Zhou ◽  
Xiao Qiang Wen ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Emission Intensity ◽  
Doping Concentration ◽  
Internal Quantum Efficiency ◽  
The Body ◽  
Luminescence Spectra ◽  
Intensity Increase ◽  
X Ray Diffraction ◽  
Red Phosphor ◽  
Red Phosphors

Sc0.88-xLu0.05VO4:Eu3+0.07,Bi3+x(0≤x≤0.05) red phosphors were synthesized by solid state reaction at 1200°C for 3h. The structure, morphology and luminescence spectra of samples are investigated by X-ray diffraction (XRD), Scanning electron microscope (SEM) and fluorescence spectrophotometer, respectively. The samples doped with Eu3+, Lu3+ and Bi3+ maintain the body-centered tetragonal structure of ScVO4 and the morphology remains essentially unchanged with slight agglomeration. The excitation spectrum of Sc0.88-xLu0.05VO4:Eu3+0.07,Bi3+x emerged redshift and the excitation intensity increase within the near UV excitation (360-400nm). The optimum doping concentration of Bi3+ is 0.02(x value), and the maximum emission intensity of Sc0.86Lu0.05VO4:Eu3+0.07,Bi3+0.02 is higher than 88 % in comparison with Sc0.88Lu0.05VO4:Eu3+0.07 under 365 nm excitation. Decay curve of 5D0 state for as-prepared samples fits the single order exponential behavior, the lifetime of 5D0 increase first and then decrease with the increase of Bi3+ doping concentration. The internal quantum efficiency is up to 74.08% under 365nm excitation; When the temperature raises to 200°C, the emission intensity maintains 79% of that in the room temperature. Sc0.86Lu0.05VO4:Eu3+0.07,Bi3+0.02 phosphor show high internal quantum efficiency and thermal stability, which is suitable for the UV-pumped white LED as red phosphor.

K2Ln(PO4)(WO4):Tb3+,Eu3+ (Ln = Y, Gd and Lu) phosphors: highly efficient pure red and tuneable emission for white light-emitting diodes

2015 ◽  
Vol 3 (9) ◽  
pp. 2107-2114 ◽  
Author(s):  
Dawei Wen ◽  
Jiajun Feng ◽  
Junhao Li ◽  
Jianxin Shi ◽  
Mingmei Wu ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
White Light ◽  
Light Emitting Diodes ◽  
Internal Quantum Efficiency ◽  
Red Phosphor ◽  
Light Emitting ◽  
Highly Efficient ◽  
White Light Emitting Diodes

K2Tb0.5Eu0.5(PO4)(WO4) red phosphor with an internal quantum efficiency of 76.45% is produced. Furthermore, the luminescence colour can be tuned from green to red by adjusting the ratio of Tb3+ and Eu3+.

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