ORGANIC LIGHT EMITTING DEVICES HAVING GRADED EMISSION REGIONS
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United States of America Patent
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Issued Date -
Mar 14, 2013
app pub date -
Jun 1, 2011
filing date -
Jun 1, 2010
priority date (Note) -
Abandoned
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Abstract
Organic light-emitting devices having an emissive region comprising a hole transport material and an electron transport material in varying material concentration across the devices. Variation of the concentration of the hole transport material and electron transport material is provided continuously or in a graded manner, as opposed to using multiple layers arranged to form a step-like gradient.
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