Sumitomo Chemical Company, Limited

Shinto Paint Co., Ltd.

Other

National Institute of Advanced Industrial Science and Technology

Independent Administrative Institution National Institute for Materials Science

Susumu Miyazaki

Keiji Ono

Takayoshi Ezuhara

Takashi Takeda

Miki Matsumura

Yuichiro Imanari

Tsuyoshi Nakano

Kenji Toda

Yoshikatsu Okada

Toshinori Isobe

Koichi Fujisawa

Kenji Saita

Mikio Kobayashi

Yoshihiro Nishisu

Yasuhiko Teshima

Tadashi Endo

Kyota Ueda

Naoto Hirosaki

Tsutomu Watanabe

Naoki Takeyama

Jun-Ichi Yasukawa

Junichi Yasukawa

Shigeki Yamamoto

Mineo Sato

Satoru Kuze

Nobuya Niizaki

Yasuteru Maeda

Shigeaki Chika

Kiyotoshi Iimura

Kouichi Satou

Takashi Kunimoto

Kenji Ono

Kazuo Tsueda

Takashi 2-5-10-801 Suisha-Machi Takeda

Naoto National Institute For Materials Science Hirosaki

A phosphor having a high brightness after being exposed to plasma and a phosphor paste containing the phosphor. The phosphor comprises a fluorescent substance Acontaining a compound represented by the following formula (I) and at least one activator selected from the group consisting of Eu and Mn, and a fluorescent substance Bcontaining an aluminate;mMO.nMO.2MO&#x2003;&#x2003;(I)[in the formula (I), Mis at least two selected from the group consisting of Ca, Sr and Ba, or Ca alone or Ba alone; Mis at least one selected from the group consisting of Mg and Zn; Mis at least one selected from the group consisting of Si and Ge; 0.5&#x2266;m&#x2266;3.5; and 0.5&#x2266;n&#x2266;2.5].

Phosphor and phosphor paste

Disclosed is a phosphor containing a nitrogen element, a compound having a garnet structure and an activator. The activator is composed of at least one element selected from the group consisting of Ce, Pr, Nd, Eu, Tb, Dy, Ho, Er, Tm, Yb and Mn.

Phosphor

An ultraviolet excited light-emitting device is disclosed. The ultraviolet excited light-emitting device comprises a phosphor having at least one selected from the group consisting of Eu and Mn as an activator and a compound represented by a formula (1):MMMO&#x2003;&#x2003;(1)wherein Mis at least two selected from the group consisting of Ca, Sr and Ba, or Sr or Ba, Mis at least one selected from the group consisting of Mg and Zn, and Mis at least one selected from the group consisting of Si and Ge in the formula (1).

Ultraviolet excited light-emitting device

A phosphor having high luminescence when excited by vacuum ultraviolet ray and a vacuum ultraviolet radiation excited light-emitting device comprising the phosphor. The phosphor comprises a metal oxide comprises at least one metal element Mselected from the group consisting of Ca, Sr and Ba, at least one metal element Mselected from the group consisting of Y, La, Gd and Lu, at least one metal element Mselected from the group consisting of Si and Ge and oxygen, and at least one metal element Lnselected from the group consisting of Ce, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, and Mn, as an activator.

Phosphor and vacuum ultraviolet excited luminescent element

A phosphor and a vacuum ultraviolet excited light-emitting device are disclosed. The phosphor comprises a compound represented by the following formula (1)CaSrEuMgSiO&#x2003;&#x2003;(1)wherein 0.1&#x3c;a&#x2266;0.35 and 0.003&#x2266;b&#x2266;0.02. The phosphor is excited by vacuum ultraviolet and emits blue light with high brightness. The vacuum ultraviolet excited light-emitting device comprises the above phosphor.

Phosphor and vacuum ultraviolet excited light-emitting device

A phosphor having small reduction in brightness when exposed to the plasma, a phosphor paste comprising the phosphor are provided. The phosphor comprises the following fluorescent substances I and II, wherein the fluorescent substance I contains silicate and Mn as an activator and the fluorescent substance II contains a compound represented by the formula (1) or a compound represented by the formula (2) and Tb as the activator.(MM)(MgZn)AlMnO&#x2003;&#x2003;(1)[In the formula (1), Mis at least one selected from the group consisting of La, Y and Gd, Mis at least one selected from the group consisting of Ca, Sr and Ba, a is not less than 0 and not more than 0.6, b is not less than 0 and not more than 1, c is not less than 0 and not more than 0.5, d is not less than 0 and not more than 0.5, b+c is not more than 1 and c+d is more than 0 and not more than 0.5.]MOAlOBO&#x2003;&#x2003;(2)[In the formula (2), Mis at least one selected from the group consisting of La, Y and Gd, m is not less than 2.5 and not more than 4.5 and n is not less than 3.5 and not more than 5.5.]

Phosphor, phosphor paste, and vacuum ultraviolet excited light-emitting device

An object of the present invention is to provide fluorescence showing a peak wavelength of excited spectrum within the wavelength range of from 350 to 500 nm and suitable for a white LED emitting yellow light, and a white LED comprising this fluorescence. This object achieved by phosphor for white. LED comprising a silicate fluorescent material and a borate fluorescent material.

Phosphor for white LED and a white LED

A process for producing a vacuum ultraviolet ray-excited light-emitting phosphor comprising the steps of

Process for producing light-emitting phosphor

A method for producing a phosphor having a high brightness is described. The method for producing a phosphor having a high brightness, comprises steps of:

Method for producing phosphor having a high brightness

A phosphor for vacuum ultraviolet ray-excited light-emitting elements which comprises a compound represented by the following formula (I):MMMMMMO&#x2003;&#x2003;(I)(wherein Mis at least one element selected from the group consisting of La, Y and Gd, Mis at least one element selected from the group consisting of Ce and Tb, Mis at least one element selected from the group consisting of Ca, Sr and Ba, Mis at least one element selected from the group consisting of Mg and Zn, Mis at least one element selected from the group consisting of Al and Ga, and Mis at least one element selected from the group consisting of Mn and Eu, and a, b, c, d, e and f are numbers satisfying the conditions of 0&#x2266;a&#x3c;1, 0&#x2266;b&#x2266;0.6, 0&#x2266;c&#x2266;0.5, 0&#x2266;d&#x2266;0.5, 0&#x2266;e&#x3c;1, 0&#x2266;f&#x3c;1, a+b+c+d&#x3c;1 and 0&#x3c;c+d+e+f), respectively.

Phosphor for vacuum ultraviolet ray-excited light-emitting element

A phosphor layer having a high luminance, and a vacuum ultra-violet radiation excited light emitting element are provided. A phosphor layer having a voidage of not less than 60 vol %, the phosphor layer in which a phosphor having a BET specific surface area of not less than 3 m/g is used, and a vacuum ultra-violet radiation excited light emitting element are provided.

High voidage phosphor layer and vacuum UV excited light emitting element

The object of the present invention is to provide a process for producing particles of a metal compound having a spherical particle shape and an average particle diameter larger than 0.3 &#x3bc;m without employing high-pressure conditions. This object is achieved by a process for producing particle of a metal compound comprising a step of adjusting pH of an aqueous solution containing urea and at least one metal element to from 4 to 8, a step of heating the aqueous solution under normal pressure, a step of separating a solid from the solution, and a step of drying the solid.

Process for producing particles of a metal compound

The object of the present invention is to provide a production method for a silicate phosphor having high brightness. This object is achieved by the method for producing a silicate phosphor comprising a step of calcining a mixture of metal compounds, wherein one of the metal compounds is silicon oxide having BET specific surface area of not less than 10 m/g.

Method for producing silicate phosphor

The objective of the present invention is to provide a phosphor for use in a light emitting element excited by vacuum ultraviolet-ray that has high brightness even after plasma exposure. This object is achieved by a phosphor comprising a compound represented by a formula M M Mn O (wherein, M represents at least one of materials selected from the group consisting of La, Y and Gd, and M represents at least one of materials selected from the group consisting of A1 and Ga, a represents a number in a range from not less than 0 to less than 1, b represents a number in a range from not less than 0 to less than 1, and sum of a and b is greater than 0), and by a light emitting element excited by vacuum ultraviolet-ray comprising the above-mentioned phosphor.

Phosphor for light-emitting element excited by vacuum ultra-violet ray

A fluorescent substance for vacuum ultraviolet radiation excited light-emitting devices which emits light with a high luminance and is subject to only a small decrease in luminance due to exposure to plasma or the like, and a vacuum ultraviolet radiation excited light-emitting device including the fluorescent substance are provided. The fluorescent substance is represented by the general formula: mM O&middot;nM O&middot;2M O wherein M is at least one metal selected from the group consisting of Ca, Sr and Ba, M is at least one metal selected from the group consisting of Mg and Zn, M is at least one metal selected from the group consisting of Si and Ge, and m and n satisfy 0.5&lE;m&lE;3.5 and 0.5&lE;n&lE;2.5, respectively. Either Eu and Mn can be used as an activator.

Growing community of inventors

Kitasoma-gun, Japan

Susumu Miyazaki