POLYMER AND ORGANIC LIGHT-EMITTING DEVICE
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United States of America Patent
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Nov 28, 2014
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Nov 28, 2014
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A composition comprising a phosphorescent compound of formula (I) and a polymer comprising a repeat unit of formula (II) Ar1 is an aryl or heteroaryl group. R2 is a substituent. A is independently in each occurrence N or CR3 wherein R3 is H or a substituent. M is a transition metal or metal ion. x is a positive integer of at least 1. y is 0 or a positive integer. L1 is a mono- or polydentate ligand. R1 is a substituent. z is 0 or a positive integer. X is O or S. The phosphorescent compound of formula (I) may be mixed with the polymer or may be covalently bound thereto. The composition may be used in the light-emitting layer of an organic light-emitting device.
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