The interlayer (IL) plays a vital role in hybrid white organic light-emitting diodes (WOLEDs); however, only a negligible amount of attention has been given to n-type ILs. Herein, the n-type IL, for the first time, has been demonstrated to achieve a high efficiency, high color rendering index (CRI), and low voltage trade-off. The device exhibits a maximum total efficiency of 41.5 lm W^–1, the highest among hybrid WOLEDs with n-type ILs. In addition, high CRIs (80–88) at practical luminances (≥ 1000 cd m^–2) have been obtained, satisfying the demand for indoor lighting. Remarkably, a CRI of 88 is the highest among hybrid WOLEDs. Moreover, the device exhibits low voltages, with a turn-on voltage of only 2.5 V (> 1 cd m^–2), which is the lowest among hybrid WOLEDs. The intrinsic working mechanism of the device has also been explored; in particular, the role of n-type ILs in regulating the distribution of charges and excitons has been unveiled. The findings demonstrate that the introduction of n-type ILs is effective in developing high-performance hybrid WOLEDs.

中间层（IL）在混合白色有机发光二极管（WOLED）中起着至关重要的作用。但是，对n型IL的关注仅可忽略不计。在此，首次证明了n型IL实现了高效率，高显色指数（CRI）和低电压折衷。该器件的最大总效率为41.5 lm W ^–1，在具有n型IL的混合WOLED中是最高的。另外，已经获得了在实际亮度（≥1000 cd m ^–2）下的高CRI（80-88），可以满足室内照明的需求。值得注意的是，CRI为88，是混合WOLED中最高的。此外，该器件具有低电压，其开启电压仅为2.5 V（> 1 cd m^–2），在混合WOLED中最低。该设备的内在工作机制也已被探索。特别是，n型IL在调节电荷和激子分布方面的作用已被揭示。研究结果表明，引入n型IL可以有效地开发高性能混合WOLED。