Canon Kabushiki Kaisha

Tomokazu Kotake

Takatoshi Tanaka

Takashi Sugiura

Ryo Taguri

Arika Tanaka

Jun Wang

Takayuki Ito

Hirokazu Miyashita

Itaru Takaya

Jun Kamatani

Naoki Yamada

Satoru Shiobara

Norifumi Kajimoto

Koji Ishizuya

Tomona Yamaguchi

Haruna Iida

Moe Takahira

An organic EL device includes at least an anode, a first light-emitting layer, an intermediate layer, a second light-emitting layer, and a cathode in this order. The intermediate layer is adjacent to the first light-emitting layer and the second light-emitting layer. The first light-emitting layer and the second light-emitting layer can trap electrons. A material constituting the intermediate layer is a hydrocarbon that has a HOMO level equal to or lower than the HOMO level of a host of the first light-emitting layer and that has a high Slevel.

Organic EL device as well as display apparatus, image pickup apparatus, communication apparatus, lighting apparatus, luminaire, and moving body each including the same

A white organic electroluminescent (EL) element includes, in sequence, an anode, a first light-emitting layer that is a blue-light-emitting layer, a hole-blocking layer, an electron transport layer, and a cathode. The hole-blocking layer is adjacent to the first light-emitting layer and the electron transport layer and formed of a hydrocarbon. The electron transport layer is formed of a nitrogen-containing heterocyclic compound. The first light-emitting layer contains a first host and a first dopant that emits blue fluorescent light. Relations (a), (b), and (c) are satisfied.LUMO(1)&#x3e;LUMO(1)&#x2003;&#x2003;(a)0.1&#x3c;(ETL)/(HBL)&#x3c;0.7&#x2003;&#x2003;(b)90 nm&#x2264;()=(HBL)+(ETL)&#x3c;150 nm&#x2003;&#x2003;(c)

White organic EL element

A recording medium includes a substrate, a first ink-receiving layer, and a second ink-receiving layer serving as a top layer in this order. The first ink-receiving layer contains an amorphous silica having an average particle size of 1.0 &#x3bc;m or more. The second ink-receiving layer contains a colloidal silica. The root-mean-square slope R&#x394;q of roughness profile elements, provided in JIS B 0601:2001, of a surface of the second ink-receiving layer is 0.3 or more.

Recording medium

A recording medium includes a substrate, a first ink-receiving layer, and a second ink-receiving layer adjacent to the first ink-receiving layer in this order. The first ink-receiving layer contains an inorganic particle having an average particle size of 50 nm or less, and the second ink-receiving layer contains an amorphous silica having an average particle size of 3.2 &#x3bc;m or more.

A recording medium includes a substrate and a first ink-receiving layer. The first ink-receiving layer contains an amorphous silica having an average particle size of 1.0 &#x3bc;m or more and an inorganic particle having an average particle size of 50 nm or less. The content of the amorphous silica in the first ink-receiving layer is 30 mass % or more and 95 mass % or less based on a total content of all inorganic particles.

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Tomokazu Kotake