单基质白光荧光粉的制备方法

sample. Inset, its luminescent photograph.
electron beam excitation. The inset shows a photograph
of the sample with white light emission.
Opt. Lett.,2009, 34, 3833–3835.
(a) PL and PLE spectra for Sr3B2O6:1% Ce3+, n% Eu2+ (n = 0.15). Inset:the conversion efficiency under UV excitation. (b) PL spectra for Sr3B2O6:1%Ce3+, n% Eu2+ phosphors excited at 351 nm. Inset: dependence of the energy transfer efficiency ηT on Eu2+ content n .
380 nm excitation
phosphorsunder 380 nm excitation: (1) x = 0; (2) x = 0.01; (3) x = 0.02; (4) x = 0.03;(5) x = 0.05; (6) x = 0.07; and (7) x = ቤተ መጻሕፍቲ ባይዱ.1. The
Dependence of emission spectra of (Ca0.993-x-yMgxSry)9Y(PO4)7: 0.007Eu2+ phosphors on concentrations of Mg2+ and Sr2+
J. Mater. Chem., 2011, 21, 104897–10495.
single-phase white light emission materials
higher CRI, tunable CCT，weak reabsorption， higher luminous efficiency
Science., 2005,308:1274-1278.
2
Approaches to realize white-light emission in a single-phase host material
Studies on producing white light in a single-phase host
Contents
1 Introduction 2 Approaches to realize white-light emission in
a single-phase host material
3 Summary and outlook
2
1
Introduction
3
1 Introduction displays
lighting
significant power saving
WLEDs Longer
lifetime
environmental friendliness
solar cells
6
2.1 Single activator ion doped systems
A. Eu2+ doped systems.
435nm
(Ca0.993-x-yMgxSry)9Y(PO4)7: 0.007Eu2+
486nm 508nm
Mg2+↑ Sr2+↑
Dq
Mg2+
Dq
Ca2+
Sr2+
Partial energy level diagram of Eu2+ ion
Adv. Funct. Mater., 2010, 20, 3446–3456.
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2.2 Multiple ions co-doping in a single host
LaOCl:Tb3+、Sm3+
LaOCl:Tm3+、Dy3+
The CL spectrum of an LaOCl:0.01Tb3+, 0.005Sm3+ The CL spectrum of LaOCl:0.002Tm3+,0.02Dy3+ under
J. Phys. Chem. C, 2010, 114, 18698–18701.
insets show CGP:0.007Eu2+,xMn2+ phosphors irradiated under
365 nm UV lamp box
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2.3 Energy transfer approach
Sr3B2O6:Ce3+, Eu2+
Excitation spectra (a: λem = 447, b: λem = 536 nm) and emission spectra (c) (λex = 350 nm) of Ba0.97Sr0.99Mg(PO4)2:0.04Eu2+ powder
如何确定掺杂Ba和Sr的比例？
J. Alloys Compd., 2010, 498, 139–142.
Adv. Funct. Mater., 2003, 13, 511–516.
1 Introduction
Red+Green+Blue=White Blue+Yellow=White
poor color rendering index, low stability of color temperature
2.1 Single activator ion doped systems
BaSrMg(PO4)2:Eu2+
Eu2+ occupying Sr2+
Eu2+ occupying Ba2+
Disadvantage：the obtained white light lack a red component, resulting in the lower CRI.
The color rendering index (CRI or Ra) definition is
based on comparing the color of test objects when illuminated by the light source under test, to the colors of the objects illuminated by a reference source.
LaOCl: xEu3+ (Sm 3 + ), yTb3+ , zTm3+
a) The CL digital photographs of LaOCl: xEu3+ , yTb3+ , zTm3+ samples. Arrow A, B, C and D represent the co-doping of Eu/Tb (high Tb3+ concentration), Eu/Tb (moderateTb3+ concentration), Eu/Tm and Tm/Sm in the LaOCl host, respectively. b) Solid-lined triangle and dash-lined triangle depict the tunable color region of LaOCl: Eu3+ , Tb3+ , Tm3+ and LaOCl: Sm3+ , Tb3+ , Tm3+ phosphors, respectively.
J. Mater. Chem., 2009, 19, 8936–8943.
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2.3 Energy transfer approach
(Ca0.993-x)9Gd(PO4)7:0.007Eu2+, xMn2+
D A
The process of energy transfer from donor to acceptor
communication
higher luminous efficiency
and brightness
White light luminescent materials are applied for a wide variety of applications.
White light-emitting diodes （ WLEDs ） are the most promising white-light source.
Typical CL spectra of LaOCl: Ln 3+. a) LaOCl: 0.8 mol% Tb 3+ , 3 mol% Eu 3+ ; b) LaOCl: 4 mol% Tb 3+ ,5 mol% Eu 3+ ; c) LaOCl: 0.5 mol% Tm 3+ , 2 mol% Eu 3 + ; d) LaOCl: 0.5 mol%Tm 3 + , 2 mol% Sm 3+ , and e) LaOCl: 1 mol% Tm 3+ , 2 mol% Tb 3+ , 2 mol%Eu 3+ . The insets are their corresponding CL digital photographs.
Color online CIE chromaticity diagram for Sr3B2O6 :m%Ce3+,n%Eu3+ excited at 351 nm. 1 m=1, n=0; 2 m=1, n=0.1; 3 m=1, n=0.15; 4 m=1, n=0.20; 5 m=1, n=0.25; 6 m=1, n=0.7; and 7 m=0, n=1. The Ce:YAG and GaN based white-emitting systems are compared with this work and portrayed in red line.