White microcavity organic light-emitting diode based on one emitting material

A microcavity organic light-emitting diode (MOLED) was developed to emit white light. The MOLED was fabricated with a simple structure of glass/dielectric mirror/ITO/NPB/Alq/MgAg. White light was observed due to the emission of two cavity modes despite only one emitter layer. By well adjusting the resonance wavelength (488 and 612 nm) and intensity, the two cavity modes give rise to a bright, white electroluminescene emission with a maximum luminance of 16435 cd/m2, maximum luminous efficiency of 11.1 cd/A. The MOLED has a CIE chromaticity coordinate of (0.32 and 0.34), which is very stable under the different applied voltage.