Zhejiang Emitting Optoelectronic Technology Co.

Jiaxing, China

Zhejiang Emitting Optoelectronic Technology Co.

Jiaxing, China
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Shi M.,Shanghai Institute of Technology | Zhao H.,Shanghai Institute of Technology | Zou J.,Shanghai Institute of Technology | Yang B.,Shanghai Institute of Technology | And 4 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2017

A new phosphor CaSnO3: Yb3+ was synthesized by a traditional solid-state reaction and the luminescent properties were investigated. The phosphors are well crystallized at 1200 °C. The excitation and the emission spectra show the characteristic broad of the Sn2+ ion and the X-ray photoelectron spectroscopy demonstrate the existence of Sn2+ ions caused by the doping of Yb3+ ions. The CaSnO3: Yb3+ phosphor showed a typical afterglow behavior when the UV source was switched off. Thermal simulated luminescence study indicated that the persistent afterglow of CaSnO3: Yb3+ phosphor was generated by the suitable electron or hole traps which were resulted from doping the calcium stannate host with rare-earth ions (Yb3+). © 2017 Springer Science+Business Media New York


Zhuang Y.,Changchun University of Science and Technology | Zhuang Y.,Shanghai Institute of Technology | Wang Y.,Changchun University of Science and Technology | Yang B.,Shanghai Institute of Technology | And 3 more authors.
Journal of Semiconductors | Year: 2017

In the paper, the influences of the chip, silicone and phosphors on the color coordinate shift of LED were studied. In the process of LED baking, it was found that the effect of the chip and silicone on the color coordinate drift is less than 3% through the analysis of each influencing factor. But the influence of the phosphors is large and accounted for 11.11% of the overall impact factors. Therefore, it is important to select the better green phosphors in thermal stability for the LED package and it has a guiding significance to the color coordinate of LED distribution. © 2017 Chinese Institute of Electronics.


Chen Z.-P.,Wenzhou University | Xiang W.-D.,Wenzhou University | Liu H.-T.,Wenzhou University | Liang X.-J.,Wenzhou University | Zou J.,Zhejiang Emitting Optoelectronic Technology Co.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2014

Ce, Sm:YAG single crystals doped with different concentrations of Sm3+ were grown by the Czochralski method. The crystal structure and optical properties were analyzed by the X-ray diffraction(XRD), absorption photoluminescence spectra. The color coordinates, luminous efficiency, color rendering index and other characteristics of the LED light source were analyzed by LED fast spectrometer. The results indicate that the main phase of Ce, Sm:YAG single crystals grown by Czochralski method was YAG crystal phase. As the Sm3+ concentration increasing, the YAG crystal structure unchanged, the red luminescence spectra intensity increased, and the CRI of white LED was also increased. When the actual concentration of Ce, Sm:YAG single crystal was 0.31wt% and the slice thickness was 0.2 mm, the light efficiency of the sample was 98.837 lm/W and the color rendering index was 71.1, which meet the requirement of commercial white LED.


Zou J.,Shanghai Institute of Technology | Li Y.,Shanghai Institute of Technology | Zhu W.,Zhejiang Emitting Optoelectronic Technology Co. | Chen H.,Zhejiang Emitting Optoelectronic Technology Co. | And 4 more authors.
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2015

The luminescence performance characterized by luminous flux, color temperature, chromaticity coordinate of three-dimensional light emitting diodes (LEDs) has been investigated by using different phosphor coating methods. The LED die was directly coating with mixed phosphors and silicone which have the maximum total luminous flux. However, this encapsulation incurs luminous uneven problem of front and back which limit three-dimensional luminescence application. Therefore, this work attempts to use the silicon and spreading powder to change the light path on the basis of less loss of luminous flux. Experimental results indicate that the brightness uniformity can be improved when increasing silicon layer between LED die and phosphor, while spreading powder layer would induce significant light attenuation. Moreover, the three packing have similar light angle. Therefore, silicon layer provides an alternative packing solution for three-dimensional LED light application. ©, 2015, Chines Academy of Sciences. All right reserved.

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