摘要： White electroluminescence is of particular importance for high resolution full-color flexible displays which employ the down-conversion scheme to generate the individual red, green and blue emissions from the color filters. Quantum dots (QD) light emitting diodes possess ultrahigh brightness and considerably narrow full-width-half-maximum (FWHM) spectra. Nevertheless, inefficient blue QDs limit the overall device performances. Herein, we introduced a boron-based blue thermally activated delayed fluorescence compound and utilized the host-guest system to construct the solution-process white devices. Red and green QDs combined with the blue emitter make it feasible to design the flexible white devices with the sharp peaks and thus intrinsically wide color gamuts. The proof-of-concept hybrid white devices with a single emissive layer exhibited the external quantum efficiencies of 6.9% (on rigid substrate) and 2.3% (on flexible substrate). The color mixing effect and energy transfer among the lumophores were exemplified with three sharp peaks at around 464, 538 and 622 nm, respectively accompanied with the corresponding FWHM of 30, 34 and 31 nm of each component.