Panasonic Electric Works

About: Panasonic Electric Works is a based out in . It is known for research contribution in the topics: Gas-discharge lamp & Layer (electronics). The organization has 1201 authors who have published 883 publications receiving 13986 citations. The organization is also known as: Matsushita Electric Works, Ltd. & MEW.

Light emitting device using LED

Abstract: A light emitting device (10) using an LED, comprising a mounting substrate (1), a light emitting element (2) mounted on the mounting substrate (1) with its face down, a fluorescent member (3) disposed to face the light-outgoing surface (S) of the light emitting element (2) in non-contact with the element (2), and an optical member (4) that distributes to the outside of the device a light beam shone thereinto from the element (2) via the member (3). A light beam from the element (2) is shone into the member (3) to excite a phosphor, and the phosphor emits a light beam having a wavelength different from that of the incident light. A light beam from the element (2) that has passed through the member (3) without being absorbed by the member and a light beam emitted from the phosphor are incident into the optical member (4) and distributed. The fluorescent member (3), being not in contact with the element (2), never receive the heat of the element (2) through heat conduction and is protected against deterioration by heat. A face-down mounting allows the fluorescent member (3) and the optical member (4) to approach the element (2) as long as they are kept out of contact with the element (2). As a result, light can be efficiently picked up whole prolonging the life of an easy-to-deteriorate phosphor or phosphor-containing resin, and light can be distributed in a specified direction.

222–282 nm AlGaN and InAlGaN-based deep-UV LEDs fabricated on high-quality AlN on sapphire

Abstract: We demonstrate 222–282 nm AlGaN and InAlGaN-based deep ultraviolet (DUV) light-emitting diodes (LEDs) fabricated on low threading dislocation density (TDD) AlN template. Low TDD AlN templates were realized by using ammonia (NH3) pulse-flow multilayer (ML) growth technique. The edge- and screw-type dislocation densities of AlN layer were reduced to 7.5 × 108 and 3.8 × 107, respectively. Single-peaked electroluminescence (EL) were obtained for 222– 273 nm AlGaN multi quantum well (MQW) DUV-LEDs. We obtained the maximum output power of 1.1 mW and 4.0 mW for the AlGaN-QW LEDs with wavelengths of 241 nm, 256 nm, respectively, under room temperature (RT) CW operations. The maximum output power of 227 nm and 222 nm AlGaN-QW were 0.15 mW and 0.014 mW, respectively, under RT pulsed operation. The maximum external quantum efficiency (EQE) of the 227 nm and 250 nm AlGaN LEDs were 0.2% and 0.43%, respectively. We also fabricated 280 nm band quaternary InAlGaN-MQW DUV-LEDs with n-type and p-type InAlGaN layers on ML-AlN templates. We demonstrated extremely high internal quantum efficiency (IQE) of 284 nm InAlGaN-QW emission, which was confirmed by the fact that the ratio of the integrated intensity of the RT-PL against the 77 K-PL was 86%. The maximum output power and EQE of the 282 nm InAlGaN LED were 10.6 mW and 1.2%, respectively, under RT CW operation. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Hydrogen in Drinking Water Reduces Dopaminergic Neuronal Loss in the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine Mouse Model of Parkinson's Disease

Abstract: It has been shown that molecular hydrogen (H2) acts as a therapeutic antioxidant and suppresses brain injury by buffering the effects of oxidative stress. Chronic oxidative stress causes neurodegenerative diseases such as Parkinson's disease (PD). Here, we show that drinking H2-containing water significantly reduced the loss of dopaminergic neurons in PD model mice using both acute and chronic administration of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP). The concentration-dependency of H2 showed that H2 as low as 0.08 ppm had almost the same effect as saturated H2 water (1.5 ppm). MPTP-induced accumulation of cellular 8-oxoguanine (8-oxoG), a marker of DNA damage, and 4-hydroxynonenal (4-HNE), a marker of lipid peroxidation were significantly decreased in the nigro-striatal dopaminergic pathway in mice drinking H2-containing water, whereas production of superoxide (O2•−) detected by intravascular injection of dihydroethidium (DHE) was not reduced significantly. Our results indicated that low concentration of H2 in drinking water can reduce oxidative stress in the brain. Thus, drinking H2-containing water may be useful in daily life to prevent or minimize the risk of life style-related oxidative stress and neurodegeneration.

Image display device

Abstract: An image display device of the present invention comprises projectors 20 and 21, a reflecting mirror 4, a screen 5, an image signal processor 1 which performs a distortion correction, and a base 6 for supporting the projectors 20 and 21, the reflecting mirror 4, and the screen 5. The projectors 20, 21, the reflecting mirror 4, and the screen 5 are assembled in one to constitute a single moving unit 7, and the image display device further comprises a lifting device 8 capable of moving the moving unit 7 in a vertical direction with respect to the base 6.