Sumitomo Chemical Company, Limited

Joled Inc.

Sadamu Yoshida

Masaki Nishimura

Hidenobu Kakimoto

Masashi Komatsu

Hirotaka Nanno

Takahiro Ueoka

Hisaaki Miyamoto

Nobuchika Iwata

A method for producing a liquid composition formed of a phosphorescent material and an organic solvent includes the steps of: dissolving a phosphorescent material in an organic solvent to prepare a mixed liquid, and filtering the mixed liquid by a filtering device. The filtering device is a housing or holder, a fluororesin membrane filter, and a filter support member. A material of a portion of the housing and holder in contact with the mixed liquid is a metal or a mixture of metal and at least one of glass, fluororesins, polyethylene not containing a phosphorus antioxidant, and polyethylene not containing an oxidized phosphorus antioxidant. A material of a portion of the filter support member in contact with the mixed liquid is at least one of metals, glass, fluororesins, polyethylene not containing a phosphorus antioxidant, and polyethylene not containing an oxidized phosphorus antioxidant.

Method for producing liquid composition

Organic light-emitting device manufacturing method performed by using a manufacturing apparatus placed where light from outside is blocked and a lighting device emitting light constituted of light components with wavelengths of 500 nm or longer is placed. The manufacturing apparatus includes a main body having an ejector ejecting ink containing organic light-emitting material and a light-transmissive tube forming at least part of a transport path connecting a tank containing the ink and the ejector. The method includes: removing the ink inside the transport path when a total exposure amount ET (lux&#xd7;hours) satisfies ET&#x2265;&#x3b1;&#xd7;17500 where &#x3b1; is a constant satisfying &#x3b1;&#x2265;1. ET is a product of E denoting light amount (lux) from the lighting device to which the tube is exposed and T denoting time amount (hours) over which the tube is exposed to the light from the lighting device.

Organic light-emitting device production method, production system therefor, and production device therefor

Growing community of inventors

Osaka, Japan

Sadamu Yoshida