Abstract: A high pressure mercury vapor lamp having an outer bulb with a plural-phosphor coating on the inside surface thereof. A first phosphor provides for emission peaks within the range of wavelengths between 440 and 540 nm and contains strontium chloroapatite, barium magnesium aluminate, strontium chlorosilicate, barium magnesium aluminate, or barium strontium silicate, each activated with di-valent europium. A second phosphor includes yttruim vanaphosphate activated with tri-valent europium which has emission peaks between 600 and 720 nm.

Abstract: Disclosed is a manufacturing method for semiconductor devices, which comprises the processes of:Forming at least one recess and at least one projecting portion on a surface of semiconductor substrate; applying coating material on the recess and the projecting portion in such a manner that the layer of the coating material in the recess is thicker than that on the projecting portion; providing a bared portion at the top of the projecting portion by removing the applied coated material on the silicon dioxide layer of the semiconductor substrate at a uniform removing rate; and diffusing impurities to form different conductivity region through the bared top portion.The highly advantageous results achieved through the use of this newly developed method are (1) the elimination of a process for the self alignment of mask, (2) the production of highly reliable semiconductor devices, and (3) an increase in the productivity of semiconductor devices.

Abstract: The present invention disclosed the phosphor coating for fluorescent high-pressure mercury-vapor lamps, consisting of a red light emitting phosphor with the following compositionYVO.sub.4 : Eu, or (PV)O.sub.4 :Euand a blue-green light emitting phosphor with the following compositionBa.sub.1.sub.-x Mg.sub.2.sub.-y Al.sub.z O.sub.3 .sub.+ 3/2 z : Eu.sub.x, Mn.sub.ywhere 0.03 .ltoreq. x .ltoreq. 0.4, 0.01 .ltoreq. y .ltoreq. 0.6, and 12 .ltoreq. z .ltoreq. 20,A highly satisfactory color rendition may be attained, and the color temperature may be arbitrarily changed so that the mercury-vapor lamps in accordance with the present invention are best adapted for use in interior lighting in offices, lobbies, shops and so on.