The mechanism of clusteroluminescence has been unveiled by investigating maleic anhydride-based polymers and copolymers.

The aggregation-induced emission (AIE) phenomenon is important in organic light-emitting diodes (OLEDs), for it can potentially solve the aggregationcaused quenching problem. However, the performance of AIE fl uorophorbased OLEDs (AIE OLEDs) is unsatisfactory, particularly for deep-blue devices (CIEy < 0.15). Here, by enhancing the device engineering, a deep-blue AIE OLED exhibits low voltage (i.e., 2.75 V at 1 cd m −2 ), high luminance (17 721 cd m −2 ), high effi ciency (4.3 lm W −1 ), and low effi ciency roll-off (3.6 lm W −1 at 1000 cd m −2 ), which is the best deep-blue AIE OLED. Then, blue AIE fl uorophors, for the fi rst time, have been demonstrated to achieve high-performance hybrid white OLEDs (WOLEDs). The two-color WOLEDs exhibit i) stable colors and the highest effi ciency among pure-white hybrid WOLEDs (32.0 lm W −1 ); ii) stable colors, high effi ciency, and very low effi ciency roll-off; or iii) unprecedented effi ciencies at high luminances (i.e., 70.2 cd A −1 , 43.4 lm W −1 at 10 000 cd m −2 ). Moreover, a three-color WOLED exhibits wide correlated color temperatures (10 690-2328 K), which is the fi rst hybrid WOLED showing sunlight-style emission. These fi ndings will open a novel concept that blue AIE fl uorophors are promising candidates to develop high-performance hybrid WOLEDs, which have a bright prospect for the future displays and lightings.