中国科学院机构知识库网格系统: 检索

Controlling the fluorescent properties of aqueous CdTe nanocrystals by modulating the growth rate 会议论文 OAI收割
25650 North Lewis Way, Stevenson Ranch, California, 91381-1439, United States
作者: Zhang Y.; Xue B.

收藏 | 浏览/下载：7/0 | 提交时间：2014/05/15

Structural and optical properties of ZnCoO thin film prepared by electrodeposition 会议论文 OAI收割
3rd International Conference on Chemical Engineering and Advanced Materials, CEAM 2013, July 6, 2013 - July 7, 2013, Guangzhou, China, July 6, 2013 - July 7, 2013
Cao P.; Bai Y.

收藏 | 浏览/下载：20/0 | 提交时间：2014/05/15

Stimulated emission of hydrothermal growth ZnO nanorods with low threshold 会议论文 OAI收割
25650 North Lewis Way, Stevenson Ranch, California, 91381-1439, United States
Zheng Z.; Duanmu Q.; Zhao D.

收藏 | 浏览/下载：8/0 | 提交时间：2014/05/15

Energy transfer in Y3Al5O12:Ce 3, Pr3+ and CaMoO4:Sm3, Eu 3 phosphors (EI CONFERENCE) 会议论文 OAI收割
作者: Wang L.; Wang X.-J.; Zhang X.; Zhang X.; Zhang X.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

Non-radiative energy transfers (ET) from Ce3 to Pr3+ in Y3Al5O12:Ce3 Pr3+ and from Sm3 to Eu3 in CaMoO4:Sm3 Eu3 are studied based on photoluminescence spectroscopy and fluorescence decay patterns. The result indicates an electric dipoledipole interaction that governs ET in the LED phosphors. For Ce3 concentration of 0.01 in YAG:Ce3 Pr3+ the rate constant and critical distance are evaluated to be 4.510-36 cm 6 s-1 and 0.81 nm respectively. An increase in the red emission line of Pr3+ relative to the yellow emission band of Ce 3 on increasing Ce3 concentration is observed. This behavior is attributed to the increase of spectral overlap integrals between Ce3 emission and Pr3+ excitation due to the fact that the yellow band shifts to the red spectral side with increasing Ce3 concentration. In CaMoO4:Sm3 Eu3 Sm 3Eu3 transfer occurs from 4G5/2 of Sm3 to 5D0 of Eu3. The rate constant of 8.510-40 cm6 s-1 and the critical transfer distance of 0.89 nm are evaluated. 2010 Elsevier B.V. All rights reserved.

Effect of thickness on the structural, electrical and optical properties of ZnO films deposited by MBE (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Advanced Design and Manufacturing Engineering, ADME 2011, September 16, 2011 - September 18, 2011, Guangzhou, China
Yang X.; Su S.; Yi X.; Mei T.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

A set of ZnO films of different thickness have been deposited on sapphire substrates using molecular beam epitaxy (MBE) by varying the growth time and the effect of film thickness on the structural electrical and optical properties have been investigated. The X-ray diffraction (XRD) results indicate that the full width at half maximum (FWHM) of the (002) diffraction peak is decreased as the film thickness increasing and the stress along c-axis is stable. Scanning electron microscope (SEM) measurement shows that the grains become more uniform as the film grows thicker and the film surface present distinct hexagon shape as the film is grown up to a thickness of 500nm. The optical absorbance Hall mobility and photoluminescence (PL) intensity are increased in accordance with the thickness of the film. (2011) Trans Tech Publications Switzerland.

Fabrication and photoluminescence of ZnS: Mn2+ nanowires/ZnO quantum dots/SiO2 heterostructure (EI CONFERENCE) 会议论文 OAI收割
作者: Yang L.; Wang D.; Wang Y.; Wang Y.; Wang Y.

收藏 | 浏览/下载：20/0 | 提交时间：2013/03/25

In this paper we demonstrated the encapsulation of ZnS: Mn2+ nanowires (NWs) and ZnO quantum dots (QDs) with a layer of mesoporous SiO 2 shell for the purpose of integrating dual emission property into one common nanostructure. The average diameter of ZnS: Mn2+ NWs ZnO QDs and ZnS: Mn2+ / ZnO@SiO2 heterostructure was about 10 nm 6 nm and 22 nm respectively. Within ZnS: Mn2+ / ZnO@SiO 2 nanocomposites the intensity of the yellow-orange emission contributed by ZnS: Mn2+ NWs and the UV emission contributed by ZnO QDs was three and ten times higher than their individual components respectively. The fluorescence intensity ratio of the dual emission can be tuned by adjusting the hydrolysis time of tetraethyl orthosilicate. The peak energy of the yellow-orange and UV emission showed blueshift and redshift as increasing the temperature respectively. The anomalous enhancement of the integrated intensity for the UV emission with the temperature indicated that the high surface state density existing in ZnO QDs can overrun the influence of temperature quenching and even alter the photoluminescent properties. 2010 American Institute of Physics.

Synthesis, morphology and optical properties of SrTiO3:Pr 3+ phosphors (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Functional Materials 2009, ISFM 2009, June 15, 2009 - June 18, 2009, Jinju, Korea, Republic of
作者: Li W.; Li W.

收藏 | 浏览/下载：11/0 | 提交时间：2013/03/25

SrTiO3:Pr3+ phosphors with different morphologies were prepared by using high-temperature solid-state reaction the solvothermal method and sol-gel synthesis. All the products were systematically characterized by powder x-ray diffraction (XRD) infrared spectroscopy (IR) scanning electron microscopy (SEM) photoluminescence (PL) and photoluminescent excitation spectra (PLE). The influence of different synthesis methods on the morphology and optical properties of SrTiO3:Pr3+ was discussed. 2010 The Royal Swedish Academy of Sciences.

Structural and photoluminescence properties of aligned Sb-doped ZnO nanocolumns synthesized by the hydrothermal method (EI CONFERENCE) 会议论文 OAI收割
作者: Wang X.; Wang X.; Wang X.; Li B.; Li B.

收藏 | 浏览/下载：17/0 | 提交时间：2013/03/25

Aligned Sb-doped ZnO nanocolumns were synthesized by a simple hydrothermal method. Based on the analyses of the X-ray diffraction and photoluminescence result it could be confirmed that the Sb has successfully doped in the ZnO crystal lattices to form an accepter energy level. At 85 K the recombination of the acceptor-bound exciton was predominant in PL spectrum which was attributed to the transition of the (SbZn-2VZn) complex bound exciton. The acceptor binding energy had been calculated to be 123 meV. 2009 Published by Elsevier B.V. All rights reserved.

ZnO thin film grown on glass by metal-organic chemical vapor deposition (EI CONFERENCE) 会议论文 OAI收割
2008 2nd IEEE International Nanoelectronics Conference, INEC 2008, March 24, 2008 - March 27, 2008, Shanghai, China
作者: Wang C.

收藏 | 浏览/下载：42/0 | 提交时间：2013/03/25

ZnO thin film was deposited on the substrate of Corning glass by metal-organic chemical vapor deposition (MOCVD)[1 2 3] with a buffer layer of SiNx grown by plasma enhanced chemical vapor deposition. The quality of ZnO film was studied by X-ray diffraction and photoluminescence measurement. We found strong diffraction (0 0 2) peak at 34.50 indicating that the ZnO film was strongly C-oriented. The full-width at half maximum of (0 0 2) peak was 0.179. 2008 IEEE.

The structural transition of Gd2O3 nanoparticles induced by high pressure (EI CONFERENCE) 会议论文 OAI收割
作者: Zhang J.; Li D.; Wang X.; Wang X.; Wang X.

收藏 | 浏览/下载：17/0 | 提交时间：2013/03/25

The structural transition of nanosize Gd2O3 is studied using high pressure energy dispersive x-ray diffraction and high pressure photoluminescence. The original structure of the nanosized sample shows a mixture of cubic and monoclinic structure. Our results show that the cubic and most of the monoclinic structure turns into hexagonal structure above 10.35GPa. But a small proportion of monoclinic structure can be present up to the highest pressure 36.2GPa. When the pressure is released the hexagonal structure partly reverts to monoclinic structure so the sample shows a mixture of hexagonal and monoclinic structure. The structural transition from monoclinic to hexagonal structure is reversible. IOP Publishing Ltd.