| 摘要 |
An organic light-emitting device comprises an anode; a cathode; a charge transporting layer comprising a charge-transporting material doped with a light-emitting dopant between the anode 2 and the cathode 5; and a light-emitting layer 4 between the anode and the cathode. The x-coordinate value and / or the y-coordinate value of CIE(x,y) coordinates of light emitted from the device is no more than 0.1, and preferably no more than 0.05, from the respective x- or y-coordinate value of a control device in which the charge transporting layer is not doped with a light-emitting dopant. Singlet or triplet excitons formed in a light emitting layer of the device may migrate into a charge transport layer instead 3 of undergoing radiative decay which is detrimental to device lifetime. A light-emitting dopant is incorporated into a charge transport layer with a relative amount of no more than 1 mol % in order to absorb excitons. The light emitting layer and charge transport material preferably comprise polymers including aryl or heteroaryl repeat units.
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