Deep
blue organic-emitting fluorophores are crucial for application in white
lighting and full color flat-panel displays but emitters with high color
quality and efficiency are rare. Herein, novel deep blue AIE luminogens
(AIEgens) with various donor units and an acceptor of cyano substituted
tetraphenylbenzene (TPB) cores were developed and used to fabricate non-doped
deep blue and hybrid white organic light-emitting diodes (OLEDs). Benefiting
from its high emission efficiency and high proportion of horizontally oriented
dipoles in the film state, the non-doped deep blue device based on CN-TPB-TPA
realized a maximum external quantum efficiency 7.27%, with a low efficiency
roll-off and CIE coordinates of (0.15, 0.08). Moreover, efficient two-color
hybrid warm white OLEDs (CIE<sub>x,y</sub> = 0.43, 0.45) were achieved using
CN-TPB-TPA as the blue-emitting layer and phosphor doped host, which realized
maximum current, power, external quantum efficiencies 58.0 cd A<sup>-1</sup>,
60.7 lm W<sup>-1</sup> and 19.1%, respectively. This work provides a general
strategy to achieve high performance, stable deep blue and hybrid white OLEDs
by construction of AIEgens with excellent horizontal orientation
LED to LEC Transition Behavior in Polymer Light-Emitting Devices
