Browsing by Author "Chen, Chin Pang"

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Degradation of AlGaInP light emitting diodes under reverse-bias operations in salty water vapor
(2015-08-01)
Chen, Hsiang
;
Chu, Li-Chen
;
Lee, Ming Ling
;
Kang, Nai Chung
;
Shei, Shih-Chang
GaP-based light emitting diodes (LEDs) reliability tests are crucial to further development for high-performance LED lighting technology. In this study, we perform reverse-bias stress tests for LEDs in water vapor and salty water vapor ambient, respectively. The results indicate that salty water vapor can quickly degrade LEDs. To investigate the failure mechanisms, electrical measurements, forward-bias and reverse-bias electroluminescence images, and multiple material analyses have been taken to study the failure mechanism. Results indicate that NaCl clustering solids and atom diffusion may cause deformation of the electrode and enhance the degradation of the LEDs. (c) 2014 Elsevier Ltd. All rights reserved.
Fabrication and characterization of cobalt nanoparticles on ZnO nanorods on a polished titanium substrate
(2015-08-01)
Lee, Ming Ling
;
Chen, Hsiang
;
Chen, Chin Pang
;
Chu, Li Chen
;
Wang, Sheng Hsin
Cobalt (Co) nanoparticles (NPs) are spread on ZnO nanorods (NRs) on a polished Ti substrate. To characterize the Co NPs on the ZnO NRs, multiple material analyses including field-emission scanning electron microscope (FESEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FIR) spectroscopy and secondary ion mass spectroscopy (SIMS) are carried out to examine the nanocomposite. Results indicate that Co NPs may accuthulate on the top part of ZnO NRs because of their sticky property. The CoNPs/ZnO NRs/Ti nanocomposite shows promise for future ferromagnetic device applications. (c) 2015 Elsevier Ltd. All rights reserved.