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Start Over Author "Qiu, Jianrong" Journal applied physics letters
41 results on '"Qiu, Jianrong"'

35. Energy transfer between silicon–oxygen-related defects and Yb3+ in transparent glass ceramics containing Ba2TiSi2O8 nanocrystals.

Author

Ye, Song, Zhu, Bin, Luo, Jin, Teng, Yu, Chen, Jingxin, Lakshminarayana, G., Qian, Guodong, and Qiu, Jianrong

Subjects
ENERGY transfer, ULTRAVIOLET radiation, ELECTRIC properties of silicon, GLASS-ceramics, NANOCRYSTALS, ELECTRONIC excitation, PHOTOEMISSION, PHOTOVOLTAIC cells
Abstract

We report on the conversion of near-ultraviolet radiation of 250–350 nm into near-infrared emission of 970–1100 nm in Yb3+-doped transparent glass ceramics containing Ba2TiSi2O8 nanocrystals due to the energy transfer from the silicon–oxygen-related defects to Yb3+ ions. Efficient Yb3+ emission (2F5/2→2F7/2) was detected under the excitation of defects absorption at 314 nm. The occurrence of energy transfer is proven by both steady state and time-resolved emission spectra, respectively, at 15 K. The Yb2O3 concentration dependent energy transfer efficiency has also been evaluated, and the maximum value is 65% for 8 mol % Yb2O3 doped glass ceramic. These materials are promising for the enhancement of photovoltaic conversion efficiency of silicon solar cells via spectra modification. [ABSTRACT FROM AUTHOR]

Published
2008
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36. Enhanced broadband near-infrared luminescence in transparent silicate glass ceramics containing Yb3+ ions and Ni2+-doped LiGa5O8 nanocrystals.

Author

Wu, Botao, Ruan, Jian, Ren, Jinjun, Chen, Danping, Zhu, Congshan, Zhou, Shifeng, and Qiu, Jianrong

Subjects
LUMINESCENCE, SILICATES, ELECTRONIC ceramics, YTTERBIUM, NICKEL, LITHIUM, NANOCRYSTALS
Abstract

Spectral properties of Yb3+/Ni2+ codoped transparent silicate glass ceramics containing LiGa5O8 nanocrystals were investigated. The near-infrared emission intensity of Ni2+ was largely increased with Yb3+ codoping due to Yb3+→Ni2+ energy transfer. The qualitative calculation of the energy transfer constant Cs-a and rate Ps-a showed that the Yb3+→Ni2+ energy transfer was much greater than in the opposite direction. Yb3+/Ni2+ codoped glass ceramics with 0.75 mol % Yb2O3 exhibited a near-infrared emission with full width at half maximum of 290 nm and fluorescent lifetime of 920 μs. The glass ceramics are promising for broadband optical amplification. [ABSTRACT FROM AUTHOR]

Published
2008
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37. Direct writing three-dimensional Ba2TiSi2O8 crystalline pattern in glass with ultrashort pulse laser.

Author

Dai, Ye, Zhu, Bin, Qiu, Jianrong, Ma, Hongliang, Lu, Bo, Cao, Shixun, and Yu, Binkung

Subjects
CRYSTAL optics, ULTRASHORT laser pulses, PHOTOLUMINESCENCE, EPITAXY, LASER beams, INTEGRATED optics
Abstract

The nonlinear optical crystal Ba2TiSi2O8 is induced three-dimensionally inside a glass by a femtosecond pulse laser with 800 nm, 250 kHz, and 150 fs. Micro-Raman and photoluminescence spectra confirm that crystals can grow in the focal point of the laser beam. Continuous crystalline lines were written through moving the focal point of the laser beam inside the glass. The results demonstrate a convenient method to engrave three-dimensional patterns of crystals with nonlinear optical properties for integrated optical devices. [ABSTRACT FROM AUTHOR]

Published
2007
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38. Metal nanoparticle precipitation in periodic arrays in Au[sub 2]O-doped glass by two interfered femtosecond laser pulses.

Author

Qu, Shiliang, Qiu, Jianrong, Zhao, Chongjun, Jiang, Xiongwei, Zeng, Huidan, Zhu, Congshan, and Hirao, K.

Subjects
*NANOPARTICLES, *ULTRASHORT laser pulses, *MICROSTRUCTURE, *NANOSTRUCTURED materials, *SURFACE plasmon resonance, *HOLOGRAPHY, *ELECTRIC furnaces
Abstract

We report on the precipitation control of Au nanoparticles in periodic arrays in silicate glass. Au[sub 2]O-doped glass samples were first irradiated by two 800 nm interfered femtosecond laser pulses at room temperature and then heat treated at 550 °C for the Au nanoparticle precipitation in the laser irradiation areas. One-dimensional periodic arrays of the Au nanoparticles were controlled by changing the pulse energy and the incident angle between the interfered laser pulses. The smallest dimension in the obtained arrays was a width of 300 nm. The mechanism of the metal nanoparticle precipitation by this technique was discussed. Only two pulses are required to encode these periodic microstructures, which are applicable to emerging nanostructure devices such as optical memory with ultrahigh storage density, micrograting with high diffractive efficiency and integrative micro-optical switches. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2004
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39. Long-lasting phosphorescence in Sn[sup 2+]–Cu[sup 2+] codoped silicate glass and its high-pressure treatment effect.

Author

Qiu, Jianbei, Miyauchi, Koichi, Kawamoto, Yoji, Kitamura, Naoyuki, Qiu, Jianrong, and Hirao, Kazuyuki

Subjects
TIN compounds, GLASS, PHOSPHORESCENCE
Abstract

Long-lasting phosphorescence was observed at 510 nm in a Sn[sup 2+] -Cu[sup 2+] codoped Na[sub 2]O-CaO-SiO[sub 2] glass at room temperature under UV illumination of 254 nm. When the glass was compressed under 3, 6, and 9 GPa, the phosphorescence shifted to 465 nm and its decay rate became shorter. The optical absorption spectra of the samples changed after compression, showing that the cupric ions were reduced to the cuprous ions. The high-pressure treatment also resulted in a lower-energy shift in the absorption edge. It was suggested that Sn[sup 2+] ions act as hole trapping centers, while oxygen vacancies surrounding by Ca[sup 2+] ions as well as active sites in the glass matrix, i.e., as electron trapping centers. [ABSTRACT FROM AUTHOR]

Published
2002
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40. Nanoscale modification of optical properties in Ge-doped SiO[sub 2] glass by electron-beam irradiation.

Author

Jiang, Nan, Qiu, Jianrong, Gaeta, Alexander L., and Silcox, John

Subjects
*GLASS, *OPTICS, *ELECTRON beams
Abstract

In this letter, we demonstrate rapid decomposition in Ge-doped SiO[sub 2] glass under high-energy electron irradiation, and comment on possible mechanisms for the interaction of the electron-beam with the glass. Nanometer-scale modifications in Ge-doped SiO[sub 2] glasses can be obtained by the redistribution of Ge in the glasses as a result of patterned electron-beam writing. [ABSTRACT FROM AUTHOR]

Published
2002
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41. Precipitation of nanometer scale Zn crystalline particles in ZnO-B[sub 2]O[sub 3]-SiO[sub 2] glass during electron irradiation.

Author

Jiang, Nan, Nan Jiang, Qiu, Jianrong, Jianrong Qiu, and Silcox, John

Subjects
PRECIPITATION (Chemistry), ZINC, CRYSTALS, PARTICLES, IRRADIATION
Abstract

In this letter, we report precipitation of nanometer scale Zn crystalline particles in Zn borosilicate glass induced by 100 keV electron irradiation. Nanometer Zn crystalline particles precipitate rapidly in the glass under high intensity electron irradiation. A double ionization mechanism is proposed in interpretation of the formation of Zn particles. Thermal effects are less important than ionization interactions. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2000
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