LAUSR

Abstract Thermally activated delayed fluorescent (TADF) based hybrid white organic light-emitting diodes (WOLEDs) have been recently developed. However, their performance is unsatisfactory. Herein, unlike previous TADF-based hybrid WOLEDs, the bipolar interlayer is demonstrated to enhance the performance. Particularly, for the first time, a scheme is proposed to remarkably enhance the lifetime (2.3 times). The two-color WOLED exhibits i) low voltage (i.e., 2.9 V at 1 cd m−2); ii) high luminance (103756 cd m−2), 10 times higher than the best hybrid WOLED based on TADF material and is also the highest for hybrid WOLEDs; iii) maximum total external quantum efficiency (EQE) and power efficiency (PE) of 23.5% and 70.92 lm W−1, respectively, among the highest hybrid WOLEDs; iv) 21.59 lm W−1 at 10000 cd m−2, ∼2.2 times higher than the best device. The three-color WOLED exhibits i) low voltage and high luminance (51514 cd m−2); ii) superior color rendering index (CRI) of 94, the first TADF-based hybrid WOLED with ultrahigh CRI (≥90); iii) EQE and PE of 17.3% and 46.09 lm W−1, respectively, among the highest WOLEDs with ultrahigh CRIs. Remarkably, ultrahigh CRIs (≥90) can be maintained at practical luminances (≥300 cd m−2).