A zero-thermal-quenching phosphor Sr3La(AlO)3(BO3)4: Dy3+ for near ultraviolet excitation white-LEDs

2021 ◽  
pp. 118610
Author(s):  
Yiyao Qian ◽  
Dachuan Zhu ◽  
Yong Pu
Keyword(s):  
Thermal Quenching ◽  
White Leds ◽  
Ultraviolet Excitation ◽  
Near Ultraviolet

Highly efficient green-emitting phosphor Sr4Al14O25:Ce,Tb with low thermal quenching and wide color gamut upon UV-light excitation for backlighting display applications

2020 ◽  
Author(s):  
Haoran Li ◽  
Yujun Liang ◽  
Shiqi Liu ◽  
Weilun Zhang ◽  
Yanying Bi ◽  
...  
Keyword(s):  
Performance Enhancement ◽  
Uv Light ◽  
Thermal Quenching ◽  
High Response ◽  
Color Gamut ◽  
Ultraviolet Excitation ◽  
Highly Efficient ◽  
Near Ultraviolet ◽  
Wide Color Gamut ◽  
Light Excitation

Highly-efficient and stable inorganic phosphors with high response to near-ultraviolet excitation are essential to the performance enhancement of the phosphor converted backlighting devices. Herein, highly-efficient green-emitting phosphors Sr4Al14O25:Ce,Tb (SAO:Ce3+,Tb3+) with...

Synthesis and Luminescence Property of Sr3Al2O6:Eu3+ Red Phosph or Prepared by Co-Precipitation Technique

2015 ◽  
Vol 1096 ◽  
pp. 486-491 ◽  
Author(s):  
Hong Mei Gao ◽  
Feng Yun Yan ◽  
Ling He
Keyword(s):  
Emission Spectrum ◽  
Thermal Quenching ◽  
Luminescent Properties ◽  
Average Diameter ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Red Phosphor ◽  
Ultraviolet Excitation ◽  
Near Ultraviolet ◽  
Co Precipitation

Sr3Al2O6:Eu3+ red phosphor was synthesized by co-precipitation and investigated their crystal structures and luminescent properties in detail. EuCl3 was used as rare earth sources to replace Eu2O3, which saving cost significantly. X-ray diffraction(XRD) and scanning electron microscopy (SEM) result indicated that the as-prepared phosphors was calcined at 1150 oC for 2h crystalized in cubic phase with space group of Pa-3 and uniform morphology. The average diameter of the phosphors were 1.8um. Excitation spectrum and emission spectrum results shows when Boric acid was added 3wt% and Eu3+ was added x=0.04((Sr1-xEux)3Al2O6), the red emission of Eu3+ centers was shown at peak of 611nm under near ultraviolet excitation with wavelength of 393nm. The emission spectrum was line spectrum. Luminous intensity achieved the optimum. The thermal quenching experiments indicated that it had thermal stability in the temperature of 20 oC -80 oC.

scholarly journals NUV-pumped luminescence of thermally stable samarium-activated alkali metal borophosphate phosphor

2021 ◽  
Author(s):  
Zhenyu Fang ◽  
Dan Yang ◽  
Youkui Zheng ◽  
Jialiang Song ◽  
Tongsheng Yang ◽  
...  
Keyword(s):  
Thermal Quenching ◽  
Particle Morphology ◽  
Color Temperature ◽  
Quenching Mechanism ◽  
Light Emitting ◽  
White Leds ◽  
Near Ultraviolet ◽  
Chromatic Properties ◽  
White Light Emitting Diodes ◽  
Powder Phase

AbstractExploring outstanding rare-earth activated inorganic phosphors with good thermostability has always been a research focus for high-power white light-emitting diodes (LEDs). In this study, we report a Sm3+-activated KNa4B2P3O13 (KNBP) powder phase. Its particle morphology, photoluminescence properties, concentration quenching mechanism, thermal quenching mechanism, and chromatic properties are demonstrated. Upon the near-ultraviolet (NUV) irradiation of 402 nm, the powder phase exhibits orange-red visible luminescence performance, originating from typical 4G5/2→6HJ/2 (J = 5, 7, 9) transitions of Sm3+. Importantly, the photoluminescence performance has good thermostability, low correlated color temperature (CCT), and high color purity (CP), indicating its promising application in the NUV-pumped warm white LEDs.

K2SiF6:Mn4+@K2SiF6 phosphor with remarkable negative thermal quenching and high water resistance for warm white LEDs

2021 ◽  
Vol 234 ◽  
pp. 117968
Author(s):  
Yuelan Li ◽  
Yan Yu ◽  
Xue Zhong ◽  
Youmiao Liu ◽  
Long Chen ◽  
...  
Keyword(s):  
Water Resistance ◽  
Thermal Quenching ◽  
High Water ◽  
White Leds

Nanocrystalline Phosphors for Lighting and Detection Applications

2010 ◽  
Vol 654-656 ◽  
pp. 1130-1133 ◽  
Author(s):  
Christopher J. Summers ◽  
Hisham M. Menkara ◽  
Richard A. Gilstrap ◽  
Mazen Menkara ◽  
Thomas Morris
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Shell Growth ◽  
Stokes Shift ◽  
Thermal Quenching ◽  
High Sensitivity ◽  
In Situ Monitoring ◽  
White Leds ◽  
Sensing Applications ◽  
Improved Stability

We report the development of new nanoparticle phosphors and quantum dot structures designed for applications to enhance the color rendering and efficiency of high brightness white LEDs, as well as for bio-sensing applications. The intrinsic problem of self-absorption, high toxicity, and high sensitivity to thermal quenching of conventional quantum dot systems has prevented their adoption to LED devices. Doped Cd-free quantum dots may circumvent these issues due to their distinct Stokes shift and improved stability at high temperature. We report on the modification of Mn-doped ZnSe/ZnS core-shell quantum dots for application to the (blue diode + yellow emitter) white LED system. Band gap tuning for 460 nm excitation, inorganic shell growth and in-situ monitoring for enhanced efficiency, and analysis of thermal stability will are reported.

Preparation and Luminescence Properties of Sr2CeO4 Doped with Ho3+

2013 ◽  
Vol 591 ◽  
pp. 272-276
Author(s):  
Fang Zhang ◽  
Chao Song ◽  
Ling Li Ma ◽  
Xiao Li Xu ◽  
Zi Fei Peng
Keyword(s):  
Sintering Temperature ◽  
Average Particle Size ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
X Ray ◽  
Ultraviolet Excitation ◽  
Near Ultraviolet ◽  
State Method ◽  
Photo Luminescent

Sr2CeO4: Ho3+ was prepared by high-temperature solid-state method. The products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and photo luminescent (PL). The Sr2CeO4:Ho3+ phosphors showed a red emission under the near-ultraviolet excitation (280 nm) and the main emission centered at 475 nm. It has been found that A+ (A+ = Li+, Na+ or K+) codoped Sr2CeO4: Ho3+ phosphors could lead to a remarkable increase of photoluminescence. Luminous intensity was the highest when doping Li+ ions. Investigation indicated that Sr2Ce0.989O4: 0.001Ho3+, 0.01Li+ exhibited the strongest emission. The average particle size was about 6 um. The optimum sintering temperature was 1200 °C and the possible mechanism was also discussed.

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