Organic light emitting devices having reduced pixel shrinkage

• US 7,087,321 B2
• Filed: 04/21/2004
• Issued: 08/08/2006
• Est. Priority Date: 04/22/2003
• Status: Expired due to Fees

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: Tsai, Jui-Yi, Knowles, David B., Ma, Bin, Kwong, Raymond, Weaver, Michael S., Barone, Michael
• Primary Examiner(s): YAMNITZKY, MARIE ROSE
• Application Number:
  US10/829,011
• Publication Number:
  US 20040241495A1
• Time in Patent Office: 839 Days
• Field of Search: 428/690, 428/917, 428/201, 428/209, 313/504, 313/505, 257/88, 257/89, 257/90, 546/2, 546/4, 546/10
• US Class Current: 428/690
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1011 Condensed systems
• CPC Class Codes: C09K 2211/1029 containing one nitrogen atom as the heteroatom
• CPC Class Codes: C09K 2211/185 of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 85/311 Phthalocyanine
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/342 comprising iridium
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
• CPC Class Codes: H10K 85/649 Aromatic compounds comprising a hetero atom
• CPC Class Codes: Y10S 428/917 Electroluminescent
• CPC Class Codes: Y10T 428/24851 Intermediate layer is discontinuous or differential

Abstract

The present invention relates to organic light emitting devices (OLEDs), and more specifically to efficient OLEDs comprising an array of pixels and having reduced pixel shrinkage. The devices of the present invention comprise further relates to materials for use as emissive materials which give reduced shrinkage when incorporated into an OLED.

Claims

1. An organic light emitting device comprising an array of pixels defined by a photoresist grid and having a pixel pitch of less than 500 μ

m, wherein each pixel comprises an emissive layer comprising a phosphorescent emissive material of the formula

2. An organic light emitting device comprising an array of pixels defined by a photoresist grid and having a pixel pitch of less than 500 μ

m, wherein each pixel comprises an emissive layer comprising a phosphorescent emissive material of the formula

3. The organic light emitting device of claim 2, wherein M is Ir.