914306-59-5Relevant articles and documents
IMPROVED STABILITY OLED MATERIALS AND DEVICES
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Page/Page column 93-94, (2008/12/05)
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.