Sumitomo Chemical Company, Limited

Kohei Asada

Kazuei Ohuchi

Osamu Goto

Shigeru Sasaki

Makoto Anryu

Chizu Sekine

Takeshi Yamada

Toshiaki Sasada

Nobuhiko Akino

Ryuji Matsumoto

Takayuki Iijima

Takakazu Saito

Yusuke Ishii

Taichi Abe

Shigeya Kobayashi

Yoshikazu Umemoto

Seiichirou Yokoya

Mayu Yoshioka

A method for driving a light emitting device is provided. The light emitting device includes an anode, a cathode, a light emitting layer disposed between the anode and the cathode, and a hole transporting layer disposed between the anode and the light emitting layer. The hole transporting layer includes a cross-linked body of a crosslinkable material. According to the method, the light emitting device is driven by pulse voltage in which a first voltage not lower than the light emission start voltage of the light emitting device and a second voltage lower than the light emission start voltage of the light emitting device are alternately switched. A light emitting apparatus equipped with the light emitting device and a driving apparatus which drives the light emitting device by pulse voltage is also provided.

Method for driving light emitting element and light emitting device

A metal complex is represented by the formula (1): In formula (1), M represents Ir or Pt, nrepresents 1 to 3, nrepresents 0 to 2, A-G-Arepresents an anionic bidentate ligand, mand mrepresent 3 or 4, Eto Erepresent a nitrogen atom or a carbon atom, Rand Rrepresent a substituent, Rand/or Ris represented by formula (2-1) or formula (2-2), Ring A represents an aromatic heterocyclic ring, Ring B represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, and R, R, R, Rand Rrepresent a substituent: 

Metal complex and light emitting device using the same

A composition is provided containing: a phosphorescent compound having an emission spectrum whose maximum peak wavelength is between 380 nm or more and less than 495 nm, having no dendron and represented by formula (1'); two or more phosphorescent compounds having an emission spectrum whose maximum peak wavelength is between 495 nm or more and less than 750 nm and having a dendron; and a compound represented by formula (H-1). In formula (1&#x2032;) M represents an iridium atom or the like, nrepresents an integer of 1 or more, nrepresents an integer of 0 or more, Eand Erepresent a carbon atom or the like, the ring Rrepresents a diazole ring, the ring Rrepresents a 6-membered aromatic hydrocarbon ring or the like, and A-G-Arepresents an anionic bidentate ligand.

Composition and light emitting device using the same

A metal complex represented by the following formula (1) is provided.  In formula (1), M represents an iridium atom or a platinum atom; nrepresents 1, 2 or 3. nrepresents 0, 1 or 2; Eto Erepresent a nitrogen atom or a carbon atom; Rto Rrepresent a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group or a halogen atom; Xand Xrepresent a direct bond, an oxygen atom, a sulfur atom, &#x2014;C(&#x2550;O)&#x2014;, &#x2014;CR&#x2014; or &#x2014;NR&#x2014;; A-G-Arepresents an anionic bidentate ligand; and Grepresents an atomic group constituting a bidentate ligand together with Aand A.

A high-molecular compound including a group indicated by general formula (11) as a repeating unit. In formula (11) n1 indicates an integer of 1-3. Arindicates an arylene group, a divalent aromatic heterocyclic group, or a divalent aromatic amine residue, and these groups may have a substituent group. If there is a plurality of Ar, the Arcan be the same or can be different. Rindicates a hydrogen atom, an alkyl group, an aryl group, a monovalent aromatic heterocyclic group, or an aralkyl group, and said groups may have a substituent group. The plurality of Rcan be the same or can be different. However, at least three of the Rare an alkyl group, an aryl group, a monovalent aromatic heterocyclic group, or an aralkyl group.

High-molecular compound and light-emitting element using same

A polymer compound has a repeating unit represented by general formula (1): wherein Rrepresents an alkyl group, an aryl group, a monovalent aromatic heterocyclic group or an aralkyl group, each possibly substituted and the same or different; and Xrepresents a group selected from formulae (1a) to (1c).] wherein Rrepresents an aryl group or a monovalent aromatic heterocyclic group, possibly substituted; and Rto Rrepresent each independently an alkyl group, an aryl group, a monovalent aromatic heterocyclic group, an alkoxy group, an aryloxy group, an aralkyl group, an arylalkoxy group, a substituted amino group, a substituted carbonyl group, a substituted carboxyl group, a fluorine atom or a cyano group; and the pairs Rand R, Rand R, Rand R, and Rand Rmay be mutually linked to form a ring together with a carbon atom to which they are linked.

A luminescent composition comprising a luminescent organic compound and a conjugated polymer compound having a luminescence maximum further toward the short wavelength end than the luminescence maximum of the luminescent organic compound at 350 nm to 500 nm, and satisfying the following formula (1);()&#xd7;&#x2267;0.04&#x2003;&#x2003;(1)in the formula,

Luminescent composition and light-emitting element using said composition

Disclosed is a composition containing a metal complex and an organic compound, wherein the difference between the absolute value of the energy level of the lowest unoccupied molecular orbit of said metal complex and the absolute value of the lowest unoccupied molecular orbit of said organic compound, as calculated with a computational technique, is less than 0.40 eV.

Composition containing a metal complex and organic compound, and light-emitting element using said compound

A light emitting material included in a light emitting device. The light emitting material includes a conjugated polymer having a conjugated part and a blue light emitting compound having a blue light emitting part and satisfies the following formula y&#x2267;log(5.1&#xd7;x+1), wherein y represents the amount of light emitted by the blue light emitting compound where the total amount of light emitted by the conjugated polymer and the blue light emitting compound in the light emitting material due to excitation caused by light having a wavelength of 370 nm is 1, and provided that the gram light absorption coefficient of the conjugated polymer and the blue light emitting compound in the light emitting material are expressed by &#x3b5;and &#x3b5;, and further the content of the blue light emitting compound is expressed by P(parts by mass) where the total content of the conjugated polymer and the blue light emitting compound in the light emitting material is 100 parts by mass, x is defined by the formula: X=(&#x3b5;2/&#x3b5;1)&#xd7;Pcorresponds to x.

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Tsukuba, Japan

Kohei Asada