Design of a luminescence pattern via altering the crystal structure and doping ions to create warm white LEDs

2014 ◽  
Vol 50 (20) ◽  
pp. 2635 ◽  
Author(s):  
Wei Lü ◽  
Yongchao Jia ◽  
Qi Zhao ◽  
Wenzhen Lv ◽  
Hongpeng You
Keyword(s):  
Crystal Structure ◽  
White Leds ◽  
Luminescence Pattern

scholarly journals Crystal structure and photophysical features of greenish perovskite type SrLa2Al2O7:Er3+ nanocrystals for down conversion white LEDs

2020 ◽  
Vol 6 (12) ◽  
pp. 126213 ◽  
Author(s):  
Priyanka Sehrawat ◽  
Avni Khatkar ◽  
Sushma Devi ◽  
Rajesh Kumar ◽  
R K Malik ◽  
...  
Keyword(s):  
Crystal Structure ◽  
White Leds ◽  
Down Conversion ◽  
Perovskite Type

Synthesis, crystal structure and luminescence properties of a Y4Si2O7N2:Ce3+ phosphor for near-UV white LEDs

2014 ◽  
Vol 2 (25) ◽  
pp. 4967-4973 ◽  
Author(s):  
Quansheng Wu ◽  
Zhigang Yang ◽  
Zhengyan Zhao ◽  
Meidan Que ◽  
Xicheng Wang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Luminescence Properties ◽  
White Leds ◽  
The Relationship

We studied the crystal structure of Y4Si2O7N2 and the relationship between the crystal structure and the luminescence properties.

Effects of Sm3+ Doping on the Photoluminescence Properties of Ca9Eu1-xSmx(VO4)7 Red-Emitting Phosphors

2012 ◽  
Vol 512-515 ◽  
pp. 1488-1493 ◽  
Author(s):  
Li Hong Liu ◽  
Rong Jun Xie ◽  
Xu Dong Sun ◽  
Qing Huang ◽  
Naoto Hirosaki
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Excitation Energy ◽  
Solid State Reaction ◽  
Emission Intensity ◽  
Solid State Reaction Method ◽  
Photoluminescence Properties ◽  
Reaction Method ◽  
White Leds ◽  
Uv Led

This paper reports the photoluminescence properties of Ca9Eu1-xSmx(VO4)7 (x=0.2-0.4) synthesized at 1250 oC in air for 12 h using traditional solid-state reaction method. With the increase of Sm3+ substitution amount, purity Ca9Eu1-xSmx(VO4)7 phase was obtained even when the Eu3+ ions were totally substituted by Sm3+. The experimental results showed that when Sm3+ was codoped with Eu3+ into Ca9Eu1-xSmx(VO4)7 crystal structure, Sm3+ would act as a sensitizer and transfer the excitation energy to Eu3+ ions and finally enhance the emission intensity of Ca9Eu1-xSmx(VO4)7 under 405 nm excitation, which leads to more favorite of this kind of phosphor used in UV LED based white LEDs.

Crystal Structure and Luminescence Properties of (Ca2.94-xLuxCe0.06)(ScMg)Si3O12Phosphors for White LEDs

2011 ◽  
Vol 32 (5) ◽  
pp. 445-450 ◽  
Author(s):  
刘永福 LIU Yong-fu ◽  
张霞 ZHANG Xia ◽  
郝振东 HAO Zhen-dong ◽  
王笑军 WANG Xiao-jun ◽  
张家骅 ZHANG Jia-hua
Keyword(s):  
Crystal Structure ◽  
Luminescence Properties ◽  
White Leds

scholarly journals Photoluminescence and energy transfer of YAG: Ce3+, Gd3+, Bi3+

2016 ◽  
Vol 06 (04) ◽  
pp. 1650029 ◽  
Author(s):  
Meidan Que ◽  
Wenxiu Que ◽  
Ting Zhou ◽  
Jinyou Shao ◽  
Lingbing Kong
Keyword(s):  
Crystal Structure ◽  
Energy Transfer ◽  
Emission Intensity ◽  
Emission Band ◽  
Emission Spectra ◽  
Excitation Band ◽  
Size Mismatch ◽  
White Leds ◽  
Orange Region ◽  
Potential Applications

In this study, Gd[Formula: see text] and Bi[Formula: see text] ions act to redshift the emission band to orange region, and to enhance significantly the maximum emission of YAG: Ce[Formula: see text]. On account that size mismatch between the host and the doped Gd[Formula: see text] ion, the crystal structure turns soft, and the emission spectra are not tuned from 540 to 570[Formula: see text]nm but decreased the emission intensity. Accordingly, an effective way to increase emission intensity is to introduce Bi[Formula: see text] ion into the YAG: Ce[Formula: see text], Gd[Formula: see text] phosphors. Experimental results show partial overlapping between the emission band of Bi[Formula: see text] ion and the excitation band of Ce[Formula: see text] ion, indicating that the energy transfer from Bi[Formula: see text] to Ce[Formula: see text] ions exists in the (Y[Formula: see text]Ce[Formula: see text]Gd)Al5O[Formula: see text]: Bi[Formula: see text] phosphor. Bi[Formula: see text] ion can serve as the activator to provide energy for Ce[Formula: see text] ion via cross relaxation phenomenon. Therefore, the (Y[Formula: see text]Ce[Formula: see text]Gd)Al5O[Formula: see text]: Bi[Formula: see text] phosphor could have potential applications in warm white LEDs.

Crystal structure, luminescence enhancement and white LEDs application of NaZnPO4:Eu3+ red phosphors

2019 ◽  
Vol 206 ◽  
pp. 260-266 ◽  
Author(s):  
Guoyi Dong ◽  
Xue Li ◽  
Heng Pan ◽  
Haotian Ma ◽  
Shuya Zhao ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Luminescence Enhancement ◽  
White Leds ◽  
Red Phosphors

Photoluminescence Properties of Sulfur-Doped Sr3SiO5: Eu2+ Phosphor for White LEDs

2013 ◽  
Vol 634-638 ◽  
pp. 2498-2501
Author(s):  
Zhi Qiang Wang ◽  
Jun Jie Liao ◽  
Qian Zhao ◽  
Hai Lin ◽  
Shu Wen Jiang
Keyword(s):  
Crystal Structure ◽  
Doping Concentration ◽  
Emission Spectra ◽  
Solid State Reaction Method ◽  
Photoluminescence Intensity ◽  
Photoluminescence Properties ◽  
White Leds ◽  
Yellow Orange ◽  
Reductive Atmosphere ◽  
Atmosphere Environment

A novel S-doped Sr3SiO5: Eu2+ phosphor was synthesized employing high temperature solid-state reaction method under reductive atmosphere environment. The crystal structure and photoluminescence properties of the phosphor, and the effect of S2- doping concentration on the photoluminescence intensity of Eu2+ was studied in details. The results show that the crystal structure of Sr3SiO5: Eu2+is not changed upon S2- doping. When the doping concentration of S2- is 1 wt%, the phosphor shows the maximum emission intensity, which is higher than that of Sr3SiO5: Eu2+ without S2-. Moreover, the addition of S2- results in an slightly shift of its emission spectra towards the red region, indicating that the S-doped Sr3SiO5: Eu2+ is an excellent yellow-orange phosphor for warm white LEDs.

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