Organic electroluminescent device and production method of the device, and display apparatus

• US 7,990,049 B2
• Filed: 09/03/2008
• Issued: 08/02/2011
• Est. Priority Date: 09/03/2007
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Shioya, Shunsuke
• Primary Examiner(s): Patel; Nimeshkumar D
• Assistant Examiner(s): Bowman; Mary Ellen
• Application Number:
  US12/203,603
• Publication Number:
  US 20090072723A1
• Time in Patent Office: 1,063 Days
• Field of Search: 313503-512, 428/690
• US Class Current: 313/504
• CPC Class Codes: H10K 2101/80 Composition varying spatially, e.g. having a spatial gradient
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 85/146 poly N-vinylcarbazol; Derivatives thereof

Abstract

Provided are an organic electroluminescent device having high efficiency and a long lifetime, and a production method of the device. The organic electroluminescent device includes an anode, a cathode, and a stacked body interposed between the anode and the cathode and formed by sequentially stacking at least an inorganic compound layer and an organic emission layer, in which the inorganic compound layer has a hole-transporting ability and a work function of the inorganic compound layer changes continuously in a film thickness direction of the inorganic compound layer.

Claims

1. An organic electroluminescent device comprising, in sequence:

(a) an anode;

(b) an inorganic compound layer comprised of molybdenum oxide;

(c) an organic emission layer; and

(d) a cathode,

wherein the ratio of oxygen atoms in the molybdenum oxide increases from the anode side to the organic emission layer side in the layer thickness direction,

wherein the inorganic compound layer has a hole-transporting ability, and

wherein a work function of the inorganic compound layer changes continuously in a film thickness direction of the inorganic compound layer.

2. The organic electroluminescent device according to claim 1, further comprising an electron-blocking layer provided between the inorganic compound layer and the organic emission layer.

3. A method of producing the organic electroluminescent device set forth in claim 1, which comprises forming the organic emission layer by a coating process.

4. A display apparatus comprising the organic electroluminescent device set forth in claim 1.

5. The organic electroluminescent device according to claim 2, wherein the election-blocking layer comprises a polymeric material.

6. The organic electroluminescent layer according to claim 1, wherein the organic emission layer comprises an oligofluorene compound.