Organometallic light-emitting material

Abstract

Disclosed herein are novel light-emitting materials of Formula I and II below. These new complexes are synthesized and found to be sufficiently stable to allow sublimation and vacuum deposition. These new emitters are electrophosphorescent and can be used in organic light-emitting devices (OLEDs) for device elements capable of emitting light of color ranging from orange to red with high-efficiency and high-brightness. wherein E=Group 16 elements (including sulphur); M=Group 10 metal (including platinum); R1-R14 are each independently selected from the group consisting of hydrogen; halogen; alkyl; substituted alkyl; aryl; substituted aryl, with substituents selected from the group consisting of halogen, lower alkyl and recognized donor and acceptor groups. R1 can also be selected from (C≡C)nR15, where (C≡C) represents a carbon-carbon triple bond (acetylide group), n is selected from 1 to 10, and R15 is selected from alkyl, aryl, substituted aryl, and tri(alkyl)silyl.

Description

RELATED APPLICATIONS [0001] The subject application claims the priority of U.S. provisional patent application No. 60 / 274,142, filed on Mar. 8, 2001.FIELD OF THE INVENTION [0002] This invention relates to light-emitting materials which are discrete organometallic molecules in nature, which can be deposited as a thin layer by vacuum deposition, and which can act as electrophosphorescent emitters in high-efficiency and high-brightness organic light-emitting devices (OLEDs). BACKGROUND OF THE INVENTION [0003] Tang and coworkers first reported on high-performance organic light-emitting devices (OLEDs) in 1987 (Tang, C. W.; et al. Appl. Phys. Lett. 51, 913 (1987)). Their discovery was based on employing a multilayer structure containing an emitting layer and a hole transport layer of a suitable organic substrate. Alq3 (q=deprotonated 8-hydroxyquinolinyl) was chosen as the emitting material and proven to be of high-performance because (1) it can form uniform thin films under 1000 Å using ...

AI Technical Summary

Benefits of technology

The present invention is about a new family of phosphorescent materials that can be used as electrophosphorescent emitters or dopants in high-performance OLEDs. These materials have been designed to tune the color of emission in the near-red range and enhance the device efficiency and brightness. They are thermally stable up to ˜400°C and good phosphorescent emitters in OLEDs. The invention includes the synthesis and applications of these materials, which can be deposited as thin layers by sublimation or vacuum deposition and fabricated into OLEDs using various methods.

Problems solved by technology

However, the quantum efficiency of an electrofluorescence device is limited by the low theoretical ratio of singlet exciton (25%) compared to triplet exciton (75%) upon electron-hole recombination from electrical excitation.

However, the Pt(I) complex used by the inventors was not stable for sublimation or vacuum deposition, thus a spin-casting method was applied, which led to higher driving voltages, quantum efficiency of 0.11% and luminance of 100 Cd / m2 were obtained at 22 V.

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