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.

A Study on Orthogonal Experiments of YAG: Ce3+ Yellow Phosphor for White LED

2011 ◽  
Vol 216 ◽  
pp. 383-387 ◽  
Author(s):  
Rong Feng Guan ◽  
Qin Qin Li ◽  
Shuai Mou Li
Keyword(s):  
Orthogonal Experiment ◽  
Luminescent Properties ◽  
Precipitation Method ◽  
Prepared Phosphor ◽  
Luminescent Materials ◽  
White Led ◽  
Yellow Phosphor ◽  
Sintering Time ◽  
Orthogonal Experiments ◽  
Co Precipitation

The YAG yellow phosphor was synthesized by Co-precipitation Method and its luminescent properties were characterized. The Orthogonal Experiment results that under laboratory conditions, the prepared phosphor luminous intensity reached at the maximum and the optical properties of compound as white up to the best with blue-chip, when calcinations temperature up to 1600°C, sintering time is 3h, the Ce3+content is 0.05.Therefore, the phosphor could provide a theoretical basis for the design and development of white LED with luminescent materials, promoting the practical of white LED.

The design and preparation of the thermally stable, Mn4+ ion activated, narrow band, red emitting fluoride Na3GaF6:Mn4+ for warm WLED applications

2017 ◽  
Vol 5 (11) ◽  
pp. 2910-2918 ◽  
Author(s):  
T. T. Deng ◽  
E. H. Song ◽  
J. Sun ◽  
L. Y. Wang ◽  
Y. Deng ◽  
...  
Keyword(s):  
Room Temperature ◽  
Narrow Band ◽  
Precipitation Method ◽  
Thermally Stable ◽  
Red Phosphor ◽  
Co Precipitation

Herein, a new red phosphor Na3GaF6:Mn4+ has been designed and synthesized by a facile two-step co-precipitation method at room temperature.

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.

scholarly journals Luminescence properties of Mn4+-doped CaAl2O4as a red emitting phosphor for white LEDs

2021 ◽  
Vol 63 (3) ◽  
pp. 3-7
Author(s):  
Thi Kim Chi Nguyen ◽  
◽  
Duy Hung Nguyen ◽  
Tan Vinh Le ◽  
Thanh Vu Tran ◽  
...  
Keyword(s):  
Great Promise ◽  
White Led ◽  
X Ray Diffraction ◽  
Red Phosphor ◽  
White Leds ◽  
Broadband Emission ◽  
Structure Morphology ◽  
Red Luminescence ◽  
Co Precipitation ◽  
Red Emitting Phosphor

A series of Mn4+-activated CaAl2O4 (CAO) compounds were synthesized by co-precipitation to seek a candidate for a red-emitting phosphor to be employed in a white LED. The crystal structure, morphology, and fluorescence properties of the as-obtained phosphors were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL). The deep red luminescence of Mn4+ in CaAl2O4 is reported and discussed. The excitation spectrum exhibited broadband emission between 260 and 550 nm with three peaks dominating at 320 nm due to the transition of 4A24T1. Theemission spectra between 600 to 720 nm displays an overwhelming emission peak at 654 nm owing to the 2E4A2 transition of Mn4+ ion.This research demonstrates the great promise of CaAl2O4:Mn4+ as a commercial red phosphor in warm white LEDs and opens up new avenues for the exploration of novel non-rare-earth red-emitting phosphors.

Fabrication and Luminescence Properties of CaMoO4:Eu3+ Red Phosphors for White LED

2010 ◽  
Vol 663-665 ◽  
pp. 441-444
Author(s):  
Zhen Hua Liang ◽  
Yu Zhi Feng ◽  
Xiao Xia Liu ◽  
Gui Hua Peng
Keyword(s):  
Luminescent Properties ◽  
Luminescence Properties ◽  
Precipitation Method ◽  
White Led ◽  
Doping Amount ◽  
Red Phosphors ◽  
Co Precipitation ◽  
The Relationship

CaMoO4: Eu3+ red phosphors were synthesized by co-precipitation method with H3BO3 as an additive and the relationship between H3BO3 doping amount and luminescent properties were studied. The brightness increased with increasing H3BO3 amount, the brightness of the CaMoO4: Eu3+ powder with 10 mol％ H3BO3 was 3.2 times higher than that of the phosphor without H3BO3.

Moisture-resistant Nb-based fluoride K2NbF7:Mn4+ and oxyfluoride phosphor K3(NbOF5)(HF2):Mn4+: synthesis, improved luminescence performance and application in warm white LED

2021 ◽  
Author(s):  
Ge Pang ◽  
Feng Hong ◽  
Xiaoyi Liu ◽  
Yunxiao Zhang ◽  
Chunyan Zhang ◽  
...  
Keyword(s):  
Acid Solution ◽  
High Efficiency ◽  
Precipitation Method ◽  
White Led ◽  
Co Precipitation ◽  
Moisture Resistant ◽  
Luminescence Performance

Herein, high-efficiency Nb-based oxyfluoride K3(NbOF5)(HF2):Mn4+ and fluoride K2NbF7:Mn4+ phosphors were successfully synthesized using different amounts of HF acid solution by simple co-precipitation method. XRD, SEM and EDS were used to...

scholarly journals Synthesis and Characterization of the CaTiO3:Eu3+ Red Phosphor by an Optimized Microwave-Assisted Sintering Process

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 874
Author(s):  
Haifeng Wang ◽  
Jianwei Lu ◽  
Ruoxuan Wang ◽  
Yungu Dong ◽  
Linfeng Ding
Keyword(s):  
Red Light ◽  
Precipitation Method ◽  
Synthesis Process ◽  
Sintering Process ◽  
Time Saving ◽  
Red Phosphor ◽  
Microwave Assisted ◽  
Furnace Sintering ◽  
Co Precipitation

The synthesis process has a significant influence on the properties of Ca1-xTiO3:Eu3+x phosphors; thus, an optimized process will lead to a better performance of the Ca1-xTiO3:Eu3+x phosphors. In this work, the feasibility of synthesizing the Ca1-xTiO3:Eu3+x phosphor with a good luminescent performance by combining the chemical co-precipitation method and microwave-assisted sintering was studied. The precursor of Ca1-xTiO3:Eu3+x phosphors were prepared by the chemical co-precipitation method. To find an optimized process, we applied both of the traditional (furnace) sintering and the microwave-assisted sintering to synthesize the Ca1-xTiO3:Eu3+x phosphors. We found out that a sintering power of 528 W for 50 min (temperature around 950 °C) by a microwave oven resulted in similar emission intensity results compared to traditional furnace sintering at 900 °C for 2.5 h. The synthesized Ca1-xTiO3:Eu3+x phosphors has an emission peak at 617 nm (5D0→7F2), which corresponds to the red light band. This new synthesized method is an energy efficient, time saving, and environmentally friendly means for the preparation of Ca1-xTiO3:Eu3+x red phosphor with good luminescent performance.

Study on co-precipitation synthesized Y3Al5O12:Ce yellow phosphor for white LED

2010 ◽  
Vol 28 (5) ◽  
pp. 713-716 ◽  
Author(s):  
Shusheng ZHANG ◽  
Weidong ZHUANG ◽  
Tao HE ◽  
Yuanhong LIU ◽  
Ronghui LIU ◽  
...  
Keyword(s):  
White Led ◽  
Yellow Phosphor ◽  
Co Precipitation
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