Stability OLED materials and devices
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United States of America Patent
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Aug 13, 2019
Grant Date -
Sep 3, 2015
app pub date -
May 15, 2015
filing date -
May 6, 2005
priority date (Note) -
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Abstract
Organic light emitting materials and devices comprising phosphorescent metal complexes comprising ligands comprising aryl or heteroaryl groups substituted at both ortho positions are described. An organic light emitting device, comprising: an anode; a hole transport layer; an organic emissive layer comprising an emissive layer host and an emissive dopant; an electron impeding layer; an electron transport layer; and a cathode disposed, in that order, over a substrate.
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