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The phase shift on the reflection from a semitransparent electrode of a top-emitting organic light-emitting device is utilized in this paper to realize a deep blue emission with high efficiency. The phase shift could be adjusted by changing the thickness of Alq 3 when it was deposited onto the semitransparent electrode of the device. Through simulation it is found that the blue shift of the resonant wavelength occurs in a certain range, which is concerned with Alq 3 thickness and the cavitydoi:10.1364/oe.17.005364 pmid:19333301 fatcat:kazle6icwnafncqlkfomqlbyny