Nichia Corporation

Other

Futaba Corporation

Masatoshi Kameshima

Hiroto Tamaki

Suguru Takashima

Takahiro Naitou

Yoshinori Murazaki

Shinpei Kinoshita

Motokazu Yamada

Shoji Hosokawa

Kazuhiko Sakai

Yoshitaka Sato

Masatsugu Ichikawa

Tomohisa Kishimoto

Daisuke Iwakura

Junji Takeichi

Takayuki Shinohara

Shoichi Yamada

A lamp includes a light-emitting body that converts electric energy into light energy and a translucent glass covering the light-emitting body, wherein a phosphor layer is provided on at least inner or outer surface of the translucent glass. The phosphor layer includes a fluorescent material including a first phosphor that at least partially converts energy emitted by an excitation source, which emits ultraviolet having a wavelength of about 365 nm, to a first emission spectrum that is different from the energy, and a second phosphor that at least partially converts the first emission spectrum to a second emission spectrum. Peak wavelengths of the emission spectrum of the first and second phosphors have a relation of complementary colors so that when the light created due to the peak wavelengths of the first and second phosphors are mixed, the resulting light is in the white region.

Fluorescent material and light-emitting device

To provide a phosphor containing a comparatively much red component and having high light emitting efficiency, high brightness and further high durability, the nitride phosphor is represented by the general formula LMN:R or LMON:R (wherein L is at least one or more selected from the Group II Elements consisting of Mg, Ca, Sr, Ba and Zn, M is at least one or more selected from the Group IV Elements in which Si is essential among C, Si and Ge, and R is at least one or more selected from the rare earth elements in which Eu is essential among Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er and Lu.); contains the another elements.

Nitride phosphor and production process thereof, and light emitting device

Provided are a phosphor which is capable of emitting green light of high luminance and in which unfavorable effects on other members has been reduced so as to be applicable to white light having excellent light emitting characteristics, a light emitting device using the phosphor, and a method for manufacturing the phosphor. The phosphor containing silicon, magnesium, and chlorine, and activated with europium and capable of emitting green light, in which the molar ratio of chlorine to magnesium is in a range of 1.0&#x2266;Cl/Mg&#x2266;1.9. Introduction of chlorine at such a composition ratio improves the light emitting characteristics and the amount of chlorine dissolved.

Phosphor activated with europium, light emitting device using the same and method of manufacturing the phosphor

In a method of manufacturing a phosphor-containing molded member, an inorganic powder in a mixture with a phosphor powder is melted by using Spark Plasma Sintering method, and then cooled. In a phosphor-containing molded member, a content of the phosphor therein is 5% by weight or more.

Phosphor-containing molded member, method of manufacturing the same, and light emitting device having the same

An oxynitride phosphor consisting of a crystal containing at least one or more of Group II elements selected from the group consisting of Be, Mg, Ca, Sr, Ba and Zn, at least one or more of Group IV elements selected from the group consisting of C, Si, Ge, Sn, Ti, Zr and Hf, and a rare earth element being an activator R, thereby providing a phosphor which is excited by an excitation light source at an ultraviolet to visible light region and which has a blue green to yellow luminescence color that is wavelength converted.

Oxynitride phosphor and production process thereof, and light-emitting device using oxynitride phosphor

A red phosphor with excellent luminescent characteristics, and a light emitting device that uses this phosphor are provided. The phosphor is a nitride phosphor that is activated by europium, and absorbs light from the near ultraviolet range to the blue range to emit red light. The nitride phosphor has the following general formula,MAlSiBN:Euwhere M is at least one element selected from the group consisting of Mg, Ca, Sr and Ba. In the general formula, w, x, y and z fall within the following ranges.

Nitride phosphor, method for producing this nitride phosphor, and light emitting device that uses this nitride phosphor

A light emitting device that light of various colors by blending lights emitted by two or more kinds of fluorescent materials which are substantially directly excited by light emitted by an excitation source having principal emission peak in a range from 250 nm to 500 nm. Each of the fluorescent materials is of a direct-transition type.

Light emitting device

A fluorescent material includes first and second phosphors. The first phosphor is a light-storing phosphor, which is represented by the general formula (MEuQ)AlO, wherein M is one type selected from the group consisting of Mg, Ca, Ba, Sr and Zn; Q is one type selected from the group consisting of Pr, Nd, Dy, Er and Ho; a is a number that satisfies 0.0001&#x2266;a&#x2266;0.5; and b is a number that satisfies 0.010&#x2266;b&#x2266;0.5. When the fluorescent material is excited for about 15 minutes by ultraviolet irradiation having about 365.0 nm wavelength with an intensity of 0.5 mW/cm, and the color of the afterglow of the fluorescent material is measured 1 minute and 10 minutes after excitation is terminated, an amount of change between chromaticity measured 1 minute after excitation and that measured 10 minutes is in the range of &#x2212;0.001&#x2266;x&#x2266;0.009 and &#x2212;0.009&#x2266;y&#x2266;0.006.

To provide a phosphor containing a comparatively much red component and having high light emitting efficiency, high brightness and further high durability, the nitride phosphor is represented by the general formula LMN:R or LMON:R (wherein L is at least one or more selected from the Group II Elements consisting of Mg, Ca, Sr, Ba and Zn, M is at least one or more selected from the Group IV Elements in which Si is essential among C, Si and Ge, and R is at least one or more selected from the rare earth elements in which Eu is essential among Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er and Lu); contains the another elements.

The present invention provides a fluorescent material comprising a light-storing first phosphor that at least partially converts energy emitted by an excitation source to a first emission spectrum that is different from the energy, and a second phosphor that at least partially converts the first emission spectrum to a second emission spectrum that is different from the first emission spectrum; a lamp equipped with such a fluorescent material; a light-emitting device that produces a whitish afterglow, comprising such a fluorescent material for converting the emission by an LED chip; and a display unit comprising a display equipped with a plurality of such light-emitting devices.

Growing community of inventors

Anan, Japan

Masatoshi Kameshima