Red, green, and blue phosphorescent resins were developed to realize full-color illuminators that shine without the need for electric power. Red phosphorescence, which used to be weak with conventional red phosphors, was enhanced notably with dye-doped resins in which green or blue phosphors were dispersed uniformly; i.e., brightness increased by seven times and afterglow duration extended by two times. Full-color phosphorescence from violet to red was attained by selecting suitable mixing ratios of the phosphors and dyes.

The problem of low drift mobility of holes in hydrogenated amorphous silicon (a-Si:H) has been solved by controlling the hydrogen content in the film. A-Si:H films with low hydrogen content have been prepared by the radical-controlled method in which the glow discharge of the mixture of SiF4 and H2 is used and the residence time of the reactant species is controlled. A prototype MOSFET demonstrates a hole mobility of 0.12 cm2/Vs and an electron mobility of 0.24 cm2/Vs, suggesting the feasibility of the a-Si CMOS circuit.

The authors try to measure the velocity distribution of water flows in a micro channel (0.4 millimeters width and 0.1 millimeters depth rectangular section) by PTV. Under the room temperature, water containing 2p-diameter tracer particles flows vertically downward in a channel. High-resolution video camera is used for grabbing images of tracer particles with illumination of a metal-halide lamp. The depth of focus is 0.04 millimeters and the focus point is adjusted at the center of the channel. The velocity distribution of micro channel flow can be obtained by PTV analysis. And the case that there is a small air bubble on the one-sided wall of a channel is also observed. In this case, the velocity of water nearby the bubble is larger than that nearby the solid wall.

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