CONTRIBUTION OF FLUORESCENCE AND EXCIPLEX EMISSION INTO VOLTAGE-DEPENDENT WHITE OLED.

In this paper, the authors present the ability to control a white organic light-emitting diode's (WOLED) color temperature and radiation intensity. The architecture is proposed and a WOLED structure is developed based on the host-guest system. The function of the guest component is performed by a red ambipolar fluorescent emitter based on quinoxaline (CTQTC), and the host material is mCP (donor component of the exciplex mCBP: PO-T2T). Electroluminescence recombination occurred on the blue exciplex/electroplex mCP-PO-T2T and the guest CTQTC emitter. The emission intensity of the CTQTC emitter does not depend on the applied voltage, unlike the other bands of the emission spectra. The additional WOLED emission maximum is in the spectrum's green region due to the electrometric nature of the TAPC hole transport layer. The color temperature of the developed WOLED varied from 3000 to 4000 K in the applied voltage range from 8 to 14V, corresponding to warm and cold white color. The device also exhibits a maximum brightness of 2968 cd/m2 and a maximum external quantum efficiency of 4.07%. [ABSTRACT FROM AUTHOR]