Advances in Valence State Analysis of Manganese in Mn4+-activated Red Phosphors for White LEDs

2020 ◽  
Vol 41 (10) ◽  
pp. 1195-1213
Author(s):  
Zhao-wu WANG ◽  
◽  
Hai-peng JI ◽  
Jian XU ◽  
Sha-sha YI ◽  
...  
Keyword(s):  
Valence State ◽  
White Leds ◽  
Red Phosphors ◽  
State Analysis

Valence state analysis of elements by EPMA and its application

1990 ◽  
Vol 48 (2) ◽  
pp. 230-231
Author(s):  
Chen Liqing ◽  
Liu Zuqin ◽  
Zhang Wei
Keyword(s):  
Valence State ◽  
Line Intensities ◽  
Valence States ◽  
Valence Electrons ◽  
Fe And Mn ◽  
Intensity Ratios ◽  
State Analysis

Valence state analyses of Fe and Mn in oxides by EPMA have been reported in literature. In this paper, the effects of valence state on intensity ratios ILα/IKα and ILα/ILβ of Cu, Ni, Co, Fe, Mn, Cr and their oxides, and on intensity ratios ILβ2/ILα1 and ILγ1/ILα1 of Mo, Nb, Zr and their oxides were studied. It was observed that intensity ratios change with valence states in accordance with some regularities, and these effects could be utilized for analyzing the valence states of catalysts.Valence state analysis of elements by EPMA is based on the fact that changes in the states of valence electrons in the outer shells of an atom cause corresponding changes in line intensities. The M electrons of Cu, Ni, Co, Fe, Mn, Cr and the N electrons of Mo, Nb, Zr are valence electrons. Line Kα1,2 and six lines of L are produced from the transitions of K-L2,3 and L-M or L-N respectively.

Synthesis, photoluminescence and Judd–Ofelt analysis of red LiGd5P2O13 : Eu3+ phosphors for white LEDs

RSC Advances ◽  
2015 ◽  
Vol 5 (67) ◽  
pp. 54622-54628 ◽  
Author(s):  
Xinguo Zhang ◽  
Liya Zhou ◽  
Qi Pang ◽  
Menglian Gong
Keyword(s):  
Thermal Stability ◽  
Solid State ◽  
Quantum Yield ◽  
Solid State Reaction ◽  
Red Light ◽  
Solid State Reaction Method ◽  
Reaction Method ◽  
White Leds ◽  
Good Thermal Stability ◽  
Red Phosphors

LiGd5P2O13 : Eu3+ red phosphors were prepared by solid-state reaction method. Phosphors could be efficiently excited by NUV/blue light and emit pure-red light. LiGd5P2O13 : Eu3+ shows good thermal stability with quantum yield of 46.5%.

Synthesis and Photoluminescence of NaGdTiO4∶Eu3+Red Phosphors for White LEDs

2011 ◽  
Vol 32 (2) ◽  
pp. 138-143 ◽  
Author(s):  
李香萍 LI Xiang-ping ◽  
仲海洋 ZHONG Hai-yang ◽  
程丽红 CHENG Li-hong ◽  
孙佳石 SUN Jia-shi ◽  
张金苏 ZHANG Jin-su ◽  
...  
Keyword(s):  
White Leds ◽  
Red Phosphors

Double perovskite (Gd0.85-xYx)2MgTiO6:0.3Eu3+ red phosphors for white LEDs with excellent high temperature performance

2019 ◽  
Vol 45 (16) ◽  
pp. 20837-20843 ◽  
Author(s):  
Xiaoyan Sun ◽  
Nan Ding ◽  
Wentao Huang ◽  
Haikui Zhu ◽  
Lixi Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Double Perovskite ◽  
White Leds ◽  
Red Phosphors ◽  
Temperature Performance

scholarly journals Lu3+ doping induced photoluminescence enhancement in novel high-efficiency Ba3Eu(BO3)3 red phosphors for near-UV-excited warm-white LEDs

RSC Advances ◽  
2018 ◽  
Vol 8 (59) ◽  
pp. 33710-33716 ◽  
Author(s):  
Bin Li ◽  
G. Annadurai ◽  
Jia Liang ◽  
Liangling Sun ◽  
Shaoying Wang ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
High Efficiency ◽  
Internal Quantum Efficiency ◽  
White Leds ◽  
Red Phosphors ◽  
Photoluminescence Enhancement

Novel high-efficiency Ba3Eu(BO3)3:Lu3+ red phosphors with internal quantum efficiency as great as 87% were developed for near-UV-excited warm-white LEDs.

Novel polygonal structure Mn4+ activated In3+-based Elpasolite-type hexafluorides red phosphor for warm white light-emitting diodes (WLEDs)

2019 ◽  
Vol 48 (4) ◽  
pp. 1376-1385 ◽  
Author(s):  
Feng Hong ◽  
Haiming Cheng ◽  
Chao Song ◽  
Guixia Liu ◽  
Wensheng Yu ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Synthetic Methods ◽  
Red Phosphor ◽  
Light Emitting ◽  
White Leds ◽  
Red Phosphors ◽  
Polygonal Structure ◽  
Warm White Light ◽  
White Light Emitting Diodes

Red phosphors (NH4)2NaInF6:Mn4+ with controllable morphology were synthesized via different synthetic methods, which can be fabricated for warm white LEDs.

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