Browsing by Author "Tseng, MR"

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Evidence of birefringence and anomalous electromagnetic-pulse propagation in an organic light-emitting diode
(2005-06-05)
Tai, SC
;
Chern, JL
;
Huang, YC
;
Tseng, MR
;
Lin, HK
dHigh-speed electromagnetic characteristics of an organic light-emitting diode (OLED) are explored in this paper. When a high-frequency (similar to 14 GHz) microwave pulse is injected into an OLED, the pulse is split into two peaks: one peak is delayed by 1.725 ns and another one is advanced by 0.183 ns, which also suggests the existence of an extremely low-speed group velocity. The effective thickness of the OLED sample is similar to 355.8 nm and, as a result, the effective index of refraction is similar to 107 when the splitting phenomenon occurs. (c) 2005 Wiley Periodicals, Inc.
Oxygen and nitrogen co-doped GeSbTe thin films for phase-change optical recording
(2002-03-01)
Dimitrov, DZ
;
Lu, YH
;
Tseng, MR
;
Hsu, WC
;
Shieh, HPD
Nitrogen and oxygen co-doped GeSbTe films for phase-change optical recording are investigated. It is found that optical properties of amorphous and crystalline state are similar to that of GeSbTe, crystallization temperature increases and crystalline microstructure is refined which indicate a nucleation rate increases by co-doping. The carrier-to-noise ratio (CNR) and erasability of phase-change optical disks are improved being up to 52 dB and 35 dB, respectively, by using an appropriate co-doping concentration in the recording layer.