Nichia Corporation

Takahiro Naitou

Hiroto Tamaki

Suguru Takashima

Masatoshi Kameshima

Motokazu Yamada

Yoshinori Murazaki

Kazuhiko Sakai

Tomohisa Kishimoto

Shoji Hosokawa

Junji Takeichi

Takayuki Shinohara

Masato Aihara

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

A light emitting device includes a wavelength converting member for absorbing light emitted by an exciting light source and emitting light of a different wavelength. With a wavelength at which the light from the exciting light source has a maximum energy intensity denoted as a first wavelength, a wavelength at which the light from the wavelength converting member has a maximum energy intensity denoted as a second wavelength, a wavelength lying between the first and second wavelengths at which the light from the light emitting device has a minimum energy intensity denoted as a third wavelength, and 650 nm denoted as a fourth wavelength, then the light emitting device has an emission spectrum such that the proportion of the energy intensity at the first wavelength to the energy intensity at the third wavelength is in a range from 100:15 to 100:150, and the proportion of the energy intensity at the first wavelength to the energy intensity at the fourth wavelength is in a range from 100:45 to 100:200.

Light emitting device

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

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.

An object of the present invention is to provide a light emitting apparatus that allows it to easily control the driving of LED and has high color rendering properties. The light emitting apparatus comprises the first light emitting devicethat has first peak emission wavelength in blue region and emits blue light, the fluorescent materialthat is excited by the light from the first light emitting deviceand emits red light, the second light emitting devicethat has second peak emission wavelength which is longer than the first peak emission wavelength and is shorter than peak emission wavelength of the fluorescent material, and the second light emitting devicethat emits green light of second peak emission wavelength which is longer than the first peak emission wavelength, so as to emit light generated by blending of blue light, green light and red light to the outside.

Light emitting apparatus

The light distribution pattern for a vehicle having a predetermined horizontal cut-off line section at the top portion on one side of the vertical central line and an oblique cut-off line section whose central line side is lowered in another side. The light distribution pattern of the light source is formed by arranging a plurality of semiconductor light emitting devices with a configuration almost the same shape as the light distribution pattern for a vehicle. The semiconductor light emitting device has a luminance surface whose configuration is almost the same shape as the light distribution pattern for a vehicle. Further, the light source comprising the semiconductor light emitting device includes a fluorescent material whose excitation source is the emission from the nitride semiconductor device and a part of region of the fluorescent material emits light with higher luminance or higher color rendering properties compared with the other regions.

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Anan, Japan

Takahiro Naitou