Organometallic compounds and emission-shifting organic electrophosphorescence

US6939624B2 · kind B2 · utility

Assignees

• UNIVERSAL DISPLAY CORPORATION · US
• University of Southern California · US
• THE TRUSTEES OF PRINCETON UNIVERSITY · US

Inventors

• Sergey Lamansky · Redmond, US
• Mark E. Thompson · Villa Park, US
• Vadim Adamovich · Yardley, US
• Peter Djurovich · Long Beach, US
• Chihaya Adachi · Fukuoka, JP
• Marc A. Baldo · Princeton, US
• Stephen R. Forrest · Ann Arbor, US
• Raymond Kwong · Plainsboro, US

Key dates

• Filing date: Oct 16, 2001
• Grant date: Sep 6, 2005
• Expiry date: Oct 16, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S428/917
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Emissive phosphorescent organometallic compounds are described that produce improved electroluminescence, particularly in the blue region of the visible spectrum. Organic light emitting devices employing such emissive phosphorescent organometallic compounds are also described. Also described is an organic light emitting layer including a host material having a lowest triplet excited state having a decay rate of less than about 1 per second; a guest material dispersed in the host material, the guest material having a lowest triplet excited state having a radiative decay rate of greater than about 1×105 or about 1×106 per second and wherein the energy level of the lowest triplet excited state of the host material is lower than the energy level of the lowest triplet excited state of the guest material.