Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Matsushita Electronics Corporation

Katsuaki Iwama

Shozo Oshio

Toshihide Maeda

Hiromi Kitahara

Hidenori Kamei

Kei Sakanoue

Yasuyuki Hanada

Tadaaki Ikeda

Haruo Shibata

Yoshichika Kobayashi

Kenji Mukai

Toshio Mori

Hiromi Tanaka

Hidezoh Akutsu

Tetsuji Takeuchi

Hidezo Akutsu

Toru Higashi

Tamisuke Atsumi

Toshifumi Kondoh

Mutsuo Takahashi

Naoki Saito

Yutaka Koyamada

Sueko Kanaya

Masanori Takagawa

A chip-type light-emitting semiconductor device includes: a substratea blue LEDmounted on the substrateand a luminescent layermade of a mixture of yellow/yellowish phosphor particlesand a base material(translucent resin). The yellow/yellowish phosphor particlesis a silicate phosphor which absorbs blue light emitted by the blue LEDto emit a fluorescence having a main emission peak in the wavelength range from 550 nm to 600 nm, inclusive, and which contains, as a main component, a compound expressed by the chemical formula: (SrBaCaEu)SiO(0&#x2264;a1&#x2264;0.3, 0&#x2264;b1&#x2264;0.8 and 0&#x3c;x&#x3c;1). The silicate phosphor particles disperse substantially evenly in the resin easily. As a result, excellent white light is obtained.

Luminescent layer and light-emitting semiconductor device

A chip-type light-emitting semiconductor device includes: a substrate; a blue LEDmounted on the substrate; and a luminescent layermade of a mixture of yellow/yellowish phosphor particlesand a base material(translucent resin). The yellow/yellowish phosphor particlesis a silicate phosphor which absorbs blue light emitted by the blue LEDto emit a fluorescence having a main emission peak in the wavelength range from 550 nm to 600 nm, inclusive, and which contains, as a main component, a compound expressed by the chemical formula: (SrBaCaEu)SiO(0&#x2266;a&#x2266;0.3, 0&#x2266;b&#x2266;0.8 and 0&#x3c;x&#x3c;1). The silicate phosphor particles disperse substantially evenly in the resin easily. As a result, excellent white light is obtained.

Light-emitting semiconductor device, light-emitting system and method for fabricating light-emitting semiconductor device

A chip-type light-emitting semiconductor device includes: a substrate; a blue LEDmounted on the substrate; and a luminescent layermade of a mixture of yellow/yellowish phosphor particlesand a base material(translucent resin). The yellow/yellowish phosphor particlesis a silicate phosphor which absorbs blue light emitted by the blue LEDto emit a fluorescence having a main emission peak in the wavelength range from 550 nm to 600 nm, inclusive, and which contains, as a main component, a compound expressed by the chemical formula: (SrBaCaEu)SiO(0&#x2266;a1&#x2266;0.3, 0&#x2266;b1&#x2266;0.8 and 0&#x3c;x&#x3c;1). The silicate phosphor particles disperse substantially evenly in the resin easily. As a result, excellent white light is obtained.

The semiconductor light emitting device is composed of a combination of a near ultraviolet LED and a phosphor layer including a plurality of phosphors for absorbing near ultraviolet emitted by the near ultraviolet LED and for emitting fluorescence having an emission peak in a visible wavelength region, and the phosphor layer includes four kinds of phosphors, that is, a blue-based phosphor, a green-based phosphor, a red-based phosphor and a yellow-based phosphor. Thus, lowering of luminous flux derived from red-based light with low luminosity is compensated by yellow-based light with comparatively high luminosity, and the resultant white-based light can be well color balanced, and hence, a semiconductor light emitting device emitting white-based light with high luminous flux and a large Ra can be obtained.

Semiconductor light emitting element and light emitting device using this

For environmental protection, a glass composition for lamps that can suppress the consumption of mercury by the glass is provided. An embodiment of the glass composition consists essentially of, expressed in percentages by weight: SiO : 65-75, Al O : 0.5-4, Na O: 1-8, K O: 1-8, Li O: 0-2, MgO: 0.5-5, CaO: 1-8, SrO: 1-7, BaO: 3.5-7, B O : 0-3, Sb O : 0-1, Fe O : 0-0.2, TiO : 0-1, CeO : 0-1; and the total amount of Na O, K O and Li O is not more than 13 weight %. The glass composition is substantially free of lead.

Glass composition, stem and bulb for lamps

A discharge lamp which radiates visible light having the following lights combined: light having an emission peak in 400 to 490 nm wavelength range in a blue spectral region; light having an emission peak in a 500 to 550 nm wavelength range in a green spectral region; and light having an emission peak in 600 to 670 nm wavelength range in a red spectral region. The color point of the radiated light lies within a region common to the following regions: a region bounded by an ellipse with a color point (u, v)&equals;(0.224, 0.330) as a center thereof, a major axis of 0.056, a minor axis of 0.024, and an angle from the u axis of 20 degrees in the CIE 1960 UCS diagram; a region bounded by an ellipse with a color point (u, v)&equals;(0.224, 0.330) as a center thereof, a major axis of 0.078, a minor axis of 0.014, and an angle from the u axis of 30 degrees in the CIE 1960 UCS diagram; a region bounded by an ellipse with a color point (u, v)&equals;(0.235, 0.335) as a center thereof, a major axis of 0.060, a minor axis of 0.030, and an angle from the u axis of 30 degrees in the CIE 1960 UCS diagram; a region bounded by an ellipse with a color point (u, v)&equals;(0.225, 0.330) as a center thereof, a major axis of 0.060, a minor axis of 0.018, and an angle from the u axis of 20 degrees in the CIE 1960 UCS diagram; and a region on a side of color temperature lower than an isotemperature line of a correlated color temperature of 3500 K.

Combined light emitting discharge lamp and luminaire using such lamp

A high color rendering fluorescent lamp having two-layered phosphor coating, wherein a first layer is formed immediately on the inner face of glass tube containing phosphors of alkaline earth halophosphate activated by antimony manganese or of alkaline earth holophosphate activated by antimony or both, and a second layer (an overriding layer) is formed on the first layer containing a phosphor having peak wavelength of emission at 470 nm-500 nm and absorbing line spectrum of mercury in visible short wavelength range, at least one of a phosphor of (Sr, Mg).sub.3 (PO.sub.4).sub.2 :Sn and a phosphor of (Sr, Ba).sub.3 (PO.sub.4).sub.2 :Sn.

High color rendering fluorescent lamp

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.

High-pressure mercury-vapor lamp having a plural phosphor coating

The present invention disclosed the phosphor coating for fluorescent high-pressure mercury-vapor lamps, consisting of a red light emitting phosphor with the following composition

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Suita, Japan

Katsuaki Iwama