Sharp Kabushiki Kaisha Corporation

Stanley Electric Co., Ltd

Kyoto University

Koninklijke Philips Corporation N.v.

Lumileds LLC

Shunsuke Murai

Motoaki Nishijima

Isao Tanaka

Koji Fujita

Koji Ohira

Toshitsugu Sueki

Yukinori Koyama

Katsuhisa Tanaka

Shogo Esaki

Yusuke Yokobayashi

Shougo Esaki

Marcus Antonius Verschuuren

Abraham Rudolf Balkenende

Jaime Gomez Rivas

Gabriel Sebastian Lozano Barbero

Yasuyuki Kawakami

Keijiro Takashima

Yosuke Maemura

Said Rahimzadeh Kalaleh Rodriguez

Syousaku Kubo

Masaru Kuramoto

Said Rahimzadeh Kalaeh Rodriguez

A wavelength conversion device includes a wavelength converter having a plate shape and a plurality of antennas. The wavelength converter converts a wavelength of incident light and generates wavelength-converted light and emits the wavelength-converted light. The plurality of antennas are disposed on a light-emitting surface of the wavelength converter. The plurality of antennas form an antenna array in a first region of the light-emitting surface. The respective plurality of antennas are arranged with a predetermined period in the first region. The antenna array is absent in a second region outside the first region. An optical path length from a light-receiving surface of the wavelength converter to the light-emitting surface of the incident light that reaches a light-emitting surface of the first region is longer than an optical path length from the light-receiving surface to the light-emitting surface of the incident light that reaches a light-emitting surface of the second region.

Wavelength conversion device and illumination device

An illumination device includes a light source configured to generate primary light having a Gaussian intensity distribution, an intensity-distribution converting member configured to convert the primary light to generate secondary light having a top-hat type intensity distribution, a wavelength converter configured to receive the secondary light from a light-receiving surface, generate tertiary light including the secondary light and wavelength-converted light in which a wavelength of the secondary light has been converted, and emit the tertiary light from an emission surface, and an antenna array having a plurality of optical antennas formed on the emission surface of the wavelength converter and arranged at a period larger than an optical wavelength of the secondary light in the wavelength converter.

Illumination device

A wavelength conversion device includes: a wavelength conversion element having a phosphor plate that converts the wavelength of incident light upon a light incident surface to generate wavelength-converted light, and emits the wavelength-converted light from a light emission surface; an antenna array constituted of a plurality of optical antennas that are periodically arranged on the light emission surface of the phosphor plate; and a recessed structure including at least one recessed portion provided in the light emission surface of the phosphor plate.

Wavelength conversion device and light source device

A wavelength conversion apparatus includes a wavelength conversion member that has an incident surface and an emitting surface and generates a wavelength-converted light by converting the wavelength of incident light that is incident on the incident surface and emits the wavelength-converted light from the emitting surface; and an antenna array including a plurality of antennas that are formed on the wavelength conversion member and arranged at a pitch P, which is equal to the approximate optical wavelength of the wavelength-converted light in the wavelength conversion member.

Wavelength conversion apparatus and light source apparatus

Embodiments of the invention include a semiconductor light emitting device for emitting a first light at a first wavelength and a wavelength conversion medium arranged to convert at least part of the first light into a second light at a second wavelength. The wavelength conversion medium is disposed between a periodic antenna array and the semiconductor light emitting device. The periodic antenna array includes a plurality of antennas. The periodic antenna array supports surface lattice resonances arising from diffractive coupling of localized surface plasmon resonances in at least one of the antennas.

A cathode active material of the present invention is a cathode active material having a composition represented by General Formula (1) below,LiFeMPSiO&#x2003;&#x2003;(1),

Cathode active material, cathode and nonaqueous secondary battery

A positive electrode active substance including a lithium-containing metal oxide represented by the following general formula (1):LiFeMPSiO&#x2003;&#x2003;(1)

Positive electrode active substance containing lithium-containing metal oxide

A cathode active material of the present invention is a cathode active material having a composition represented by General Formula (1) below,LiFeMPSiO&#x2003;&#x2003;(1), where: an average valence of Fe is +2 or more; M is an element having a valence of +2 or more and is at least one type of element selected from the group consisting of Zr, Sn, Y, and Al; the valence of M is different from the average valence of Fe; 0&#x3c;x&#x2266;0.5; and y=x&#xd7;({valence of M}&#x2212;2)+(1&#x2212;x)&#xd7;({average valence of Fe}&#x2212;2). This provides a cathode active material that not only excels in terms of safety and cost but also can provide a long-life battery.

Provided is a positive electrode active material giving nonaqueous-electrolyte secondary batteries superior in cycle characteristics. The positive electrode active material according to the present invention includes a lithium-containing composite metal oxide having the composition represented by the following General Formula (1):LiFeMPSiO&#x2003;&#x2003;(1)(wherein M is at least one metal element selected from Zr, Sn, Y, and Al, 0.05&#x3c;x&#x3c;1, and 0.05&#x3c;y&#x3c;1), characterized in that: the positive electrode active material is in the single crystalline phase of the lithium-containing composite oxide represented by General Formula (1) when 1&#x3e;z&#x3e;0.9 to 0.75 or 0.25 to 0.1&#x3e;z&#x3e;0;the positive electrode active material has two crystalline phases of the lithium-containing composite oxides represented by the following General Formulae (2) and (3) when 0.9 to 0.75&#x3e;z&#x3e;0.25 to 0.1:LiFeMPSiO&#x2003;&#x2003;(2)(wherein 0.75 to 0.9&#x2266;a&#x2266;1.00, 0.05&#x3c;x&#x3c;1, and 0.05&#x3c;y&#x3c;1); andLiFeMPSiO&#x2003;&#x2003;(3)(wherein, 0&#x2266;b&#x2266;0.1 to 0.25+x, 0.05&#x3c;x&#x3c;1, and 0.05&#x3c;y&#x3c;1), andwhen the product of the lengths of the b and c axes of the unit cell of the lithium-containing composite oxide of General Formula (2) is designated as bc1 and the product of the lengths of the b and c axes of the unit cell of the lithium-containing composite oxide of General Formula (3) as bc2, &#x3b1;, which is defined by equation &#x3b1;=(bc2)/(bc1), is 0.99&#x3c;&#x3b1;&#x3c;1.01.

Positive electrode active material, positive electrode, and nonaqueous-electrolyte secondary battery

Proposed is an illumination device (), comprising a light source () such as an LED or a laser diode, a wavelength conversion medium () such as a phosphor, and a periodic antenna array () made of a highly polarisable material such as a metal. The light source emits primary wavelength light that at least partially is converted in secondary wavelength light by the wavelength conversion medium. The periodic antenna array is positioned in close proximity to the wavelength conversion medium and functions to enhance the efficiency of the absorption and/or emission processes in the wavelength conversion medium through the coupling of the incident primary wavelength light or the emitted secondary light to surface lattice resonances that arise from the diffractive coupling of localized surface plasmon polaritons in the individual antennas of the array. This is especially advantageous for forming low &#xe9;tendue illumination device suitable for use in projection systems, or for controlling the directionality, the polarization, and/or the color of the secondary wavelength light.

A method of producing a positive electrode active material, comprising the steps of:

Positive electrode active material, production method thereof and its use

The present invention provides a method for producing a lithium-containing composite oxide represented by general formula (1) below, the method at least including a step of preparing a solution by dissolving a lithium source, an element M source, a phosphorus source, and an element X source that serve as source materials in a solvent, the phosphorus source being added after at least the element M source is dissolved; a step of gelating the resulting solution; and a step of calcining the resulting gel:LiMPXO&#x2003;&#x2003;(1)(where M represents at least one element selected from the group consisting of Fe, Ni, Mn, Zr, Sn, Al, and Y; X represents at least one element selected from the group consisting of Si and Al; and 0&#x3c;x&#x2266;2, 0.8&#x2266;y&#x2266;1.2, 0&#x2266;z&#x2266;1). According to the present invention, a positive electrode active material for lithium secondary batteries that offers high safety and high cost efficiency and are capable of extending battery life can be provided.

Growing community of inventors

Kyoto, Japan

Shunsuke Murai