Tottori University

Merck Patent Gmbh

Mitsui Minings & Melting Co., Ltd.

Nec Lighting, Ltd.

Koutoku Ohmi

Hiroshi Okura

Jun-ichi Itoh

Asuka Sasakura

Maki Minamoto

Stephan Dertinger

Tomoyasu Yano

Takeo Wakimoto

Makoto Higuchi

Yoshinobu Miyamoto

Kazuaki Tsuji

Tadashi Ishigaki

The invention relates to co-activated silicate based phosphors. The invention further relates to the method of preparing these phosphors and to the use of these phosphors in electronic and electrooptical devices, in particular in light emitting diodes (LEDs) and solar cells. The invention further relates to illumination units comprising said phosphors.

Silicate-based phosphor

A fluorescent substance capable of remarkably increasing the luminous intensity of a I-III-VIchalcopyrite type compound having a large band gap among chalcopyrite type compounds with manganese as luminescence centers, and being favorably used for a lighting device using a light emitting diode, a light emitting element of a display device or the like, a light emitting device such as fluorescent lamps such as a cold cathode fluorescent lamp and a hot cathode fluorescent lamp, as a fluorescent substance generating fluorescence by ultraviolet excitation, is provided. The fluorescent substance is expressed by composition formula (1)Cu(AlGa)(SSe):Mn,Si&#x2003;&#x2003;(1)(wherein x represents a number satisfying 0&#x2266;x&#x2266;0.4, and y represents a number satisfying 0&#x2266;y&#x2266;0.4), including manganese as a luminescence center atom.

Fluorescent substance and light emitting device using the same

A method for producing a blue phosphor, comprising firing a mixture for 2 to 24 hours at a temperature of 800&#xb0; C. or higher in an atmosphere of hydrogen sulfide, carbon disulfide, or an inert gas, the mixture containing a barium compound component, a silicon compound component, and a cerium compound component in quantitative proportions such that the atomic ratios of the components fulfill the equations 0.50&#x3c;Si/Ba&#x2266;0.70 and 0.0005 &#x2266;Ce/Ba&#x2266;0.03, or the mixture further containing a sulfur compound component in addition to these components. The blue phosphor has high color purity, high luminance, high chemical stability, and a low crystallization temperature, and is suitable for use in displays such as FED, PDP, and EL displays, or for use in the excitation of near-ultraviolet LED.

Method for producing blue phosphor

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Tottori, Japan

Koutoku Ohmi