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Materials
Ce
3+
ion-doped
α
-NaYF
4
single crystal for UV laser
Dongsheng Jiang
1
Haiping Xia
1,*
Jian Zhang
1
Zhigang Feng
1
[ ... ]
Baojiu Chen
3
Author Affiliations
Abstract
1
Key Laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, China
2
Ningbo Institute of Materials Technology and Engineering, the Chinese Academy of Sciences, Ningbo 315211, China
3
Department of Physics, Dalian Maritime University, Dalian 116026, China
A
Ce
3
+
ion-doped
α
-
NaYF
4
single crystal of high quality is grown successfully by an improved flux Bridgman method under the conditions of taking the chemical raw composition of
NaF
:
KF
:
YF
3
:
CeF
3
in the molar ratio of
30
∶
18
∶
48
∶
4
, where the KF is shown to be an effective assistant flux. The x ray diffraction, absorption spectra, excitation spectra, and emission spectra of the
Ce
3
+
-doped
α
-
NaYF
4
single crystal are measured to investigate the phase and optical properties of the single crystals. The absorption spectrum of the
Ce
3
+
:
α
-
NaYF
4
shows a strong band that peaks at the wavelength of 300 nm. The emission spectrum of the
Ce
3
+
:
α
-
NaYF
4
emits an intense ultraviolet (UV) band at the wavelength of 332 nm under the excitation of 300 nm light. Two separated luminous bands of 330 and 350 nm, which correspond to the transitions
5
d
→
F
5
/
2
2
and
5<
160.0160
Materials
230.0230
Optical devices
260.1180
Crystal optics
300.0300
Spectroscopy
PDF全文
Full Text
Chinese Optics Letters
2016, 14(6): 061601
Materials
Luminescence of Tb
3+
/Eu
3+
codoped LiYF
4
single crystals under UV excitation for white-light LEDs
Yongzhang Jiang
1
Haiping Xia
1,*
Shuo Yang
1
Jiazhong Zhang
1
[ ... ]
Baojiu Chen
3
Author Affiliations
Abstract
1
Key Laboratory of Photo-Electronic Materials, Ningbo University, Ningbo 315211, China
2
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315211, China
3
Department of Physics, Dalian Maritime University, Dalian 116026, China
The absorption spectra, excitation spectra, and emission spectra of
Tb
3
+
/
Eu
3
+
ions in
LiYF
4
single crystals synthesized by an improved Bridgman method are measured. The emission spectra of several bands, mainly located at blue
~
487
nm
(
Tb
:
D
4
5
→
F
7
6
), yellowish green
~
542
nm
(
Tb
:
D
4
5
→
F
7
5
), and red
~
611
nm
(
Eu
:
D
0
5
→
F
7
2
) wavelengths, are observed under excitation by UV light. An ideal white light emission as a result of simultaneous combination of these emissions can be obtained from 1.11 mol%
160.0160
Materials
230.0230
Optical devices
300.0300
Spectroscopy
PDF全文
Full Text
Chinese Optics Letters
2015, 13(7): 071601
Materials
Tm3+ and Nd3+ singly doped LiYF4 single crystals with 3-5 \mu m mid-infrared luminescence
Download:985次
Shanshan Li
Peiyuan Wang
Haiping Xia
Jiangtao Peng
[ ... ]
Haochuan Jiang
Author Affiliations
Abstract
Mid-infrared (MIR) emissions of 2.4 and 3.5 m from Tm3+:LiYF4 single crystals attributed to 3H4->3H5 and 3H5->3F4 transitions as well as MIR emissions of 4.2, 4.3, and 4.5 \mu m from Nd3+: LiYF4 lasers attributed to 4I15/2->4I13/2,4I13/2->4I11/2, and 4I11/2->4I9/2 transitions, respectively, are observed. LiYF4 single crystals possess high transmittance of over 85% in the 2.5-6 \mu m range. The large emission crosssections of Tm-doped crystals at 2.4 \mu m (1.9\times 10-20 cm2) and Nd-doped crystals at 4.2 \mu m (0.84\times 10-20cm2) as well as the high rare-earth doping concentrations, excellent optical transmission, and chemicalphysical properties of the resultant samples indicate that Nd3+ and Tm3+ singly doped crystals may be promising materials for application in MIR lasers.
160.3380
Laser materials
160.4760
Optical properties
160.5690
Rare-earth-doped materials
140.3380
Laser materials
PDF全文
Full Text
Chinese Optics Letters
2014, 12(2): 021601
Materials
Dy3+-doped LiYF4 crystals for UV-excited white light-emitting diodes
Download:687次
Lei Tang
Haiping Xia
Peiyuan Wang
Jiangtao Peng
Haochuan Jiang
Author Affiliations
Abstract
A Dy3+-doped LiYF4 single crystal capable of generating white light by simultaneous blue and yellow light emission of phosphorescent centers is produced. Chromaticity coordinates and photoluminescence intensity vary with excitation wavelength. Under 350, 365, and 388 nm excitation, the crystal shows excellent white light emission. The most efficient wavelength for white light is 388 nm. The CIE coordinates are x=0.316 and y =0.321, and the color temperature (Tc) is 6 368 K. These results indicate that the studied crystal is a potential candidate for ultraviolet light-excited white light-emitting diodes.
160.0160
Materials
230.0230
Optical devices
300.0300
Spectroscopy
PDF全文
Full Text
Chinese Optics Letters
2013, 11(6): 061603
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