National Center for Quality Inspection and Supervision of Product

Changzhou, China

National Center for Quality Inspection and Supervision of Product

Changzhou, China

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Zhang J.,CAS Shanghai Institute of Technical Physics | Zhang T.,CAS Shanghai Institute of Technical Physics | Zhang T.,National Center for Quality Inspection and Supervision of Product | Liu S.,CAS Shanghai Institute of Technical Physics | And 6 more authors.
Chinese Optics Letters | Year: 2013

Transient thermal impedance of GaN-based high-power white light emitting diodes (LEDs) is created using a thermal transient tester. An electro-thermal simulation shows that LED junction temperature (JT) rises to a very low degree under low duty cycle pulsed current. At the same JT, emission peaks are equivalent at pulsed and continuous currents. Moreover, the difference in peak wavelength when a LED is driven by pulsed and continuous currents initially decreases then increases with increasing pulse width. Thus, selecting an appropriate pulse width decreases errors in JT measurement. © 2013 Chinese Optics Letters.


Zhang J.-J.,CAS Shanghai Institute of Technical Physics | Zhang T.,CAS Shanghai Institute of Technical Physics | Zhang T.,National Center for Quality Inspection and Supervision of Product | Jin Y.-F.,Changzhou Institute of Technology | And 8 more authors.
Optoelectronics Letters | Year: 2014

A tunable surface-emitting integrated lighting system is constructed using a combination of inorganic light-emitting diodes (LEDs) and transparent organic LEDs (OLEDs). An RB two-color LED is used to supply red and blue light emission, and a green organic LED is used to supply green light emission. Currents of the LED and OLED are tuned to produce a white color, showing different Commission Internationale d'Eclairage (CIE) chromaticity coordinates and correlated color temperatures with a wide adjustable range. Such an integration can compensate for the lack of the LED's luminance uniformity and the transparent OLED's luminance intensity. © 2014 Tianjin University of Technology and Springer-Verlag Berlin Heidelberg.


Wang B.,Luoyang Institute of Science and Technology | Chang D.-H.,Luoyang Institute of Science and Technology | Lu G.,Luoyang Institute of Science and Technology | Wang T.-H.,National Center for Quality Inspection and Supervision of Product | And 2 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2013

The Vitamin B12 molecule has long fascinated chemists because of its exclusive complex structure and unusual reactivities in biological systems. In order to achieve a better understanding of the structural attribute of the Vitamin B12 molecule when it interacted with metal, in the present paper, the Vitamin B12 molecules adsorbed on variation of copper electrode potential from 0 to -1.0 V was studied by surface-enhanced Raman spectroscopy (SERS). An excellent SERS substrate was obtained with in-situ electrochemical oxidation-reduction cycle (ORC), and its surface roughness was characterized by atomic force microscope (AFM). Assignments of Raman peaks observed by normal Raman spectrum (NRS) and SERS spectra of Vitamin B12 molecule were given based on previous literatures. It was found that the potential-dependent relative intensity changed in SERS spectra which depended on the Vitamin B12 molecular orientation with respect to the copper surface according to the surface selection rule (SSR). It was concluded that the corrin ring was adsorbed in tilt form on copper surface and the Co-CN group was farther away from the copper surface at higher potentials. With the decrease in potential, the tilt angle between the corrin ring and copper surface became smaller, then the Co-N group and 5, 6 dimethylbenzimidazole group got close to the copper surface. The results offered an important structural attribute of Vitamin B12 molecule when it interacted with copper electrode for the first time, and supplied a meaningful reference for the electrochemical bioactivity of the Vitamin B12 molecule.

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