The electroluminescence spectra of organic light-emitting diodes can be tuned by controlling the space charge density in the emission layer, and both red and blue shifts in the electroluminescence spectra are realized. The origin of the space charge induced spectra shift is ascribed to the space charge redistribution as response to the dipole moment variation of the organic emitters at excitation and ground states. The space charge density in the emission layer can be controlled by simply designing the device structure and layer configuration, which may have potential for optimizing the color coordinates of organic light-emitting diodes.
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