We present a simple hybrid white organic light-emitting diodes (WOLED) consisting of only two layers, i.e., a hole-transporting layer and an emitting layer. The emitting layer is formed by simply co-doping a green phosphor and a red phosphor in bis[2-(2-hydroxyphenyl)-pyridine]beryllium (Bepp2), which acts as the blue emitter, electron-transport material, and high triplet energy host for the phosphors, i.e., a multifunctional chromophore. This simple device exhibits a maximum power and quantum efficiency of 46.8 lm W−1 and 16.5%, respectively, with a good CRI up to 90. The versatile experimental techniques are performed to gain a deep understanding of the emission mechanism. We believe that this simple design concept can provide a new avenue for achieving ultrahigh performance WOLEDs for lighting application.Graphical abstractAn ultra-simple hybrid WOLED with high efficiency (46.8 lm W-1 and 16.5%) and CRI (90) is reported. This is one of the best hybrid WOLEDs’ stories so far considering the comprehensive properties. Versatile experimental techniques are performed to gain a deep understanding of the emission mechanism. We believe that this simple design concept can provide a new avenue for achieving ultrahigh-performance hybrid WOLEDs for lighting application.Highlights► Highly efficient hybrid white organic light-emitting diode was proposed. ► The simple device consists of a hole-transporting layer and an emitting layer. ► The maximum power efficiency of 46.8 lm W−1 with CRI up to 90 was achieved. ► This concept offers a low-cost fabrication process for hybrid white device.

•MEL were observed in low phosphorescent doping device.•Two different mechanisms are used to explain the different MEL shapes.•The diffusion process of triplets was attributed to the formation of Lorentz shape.•Linear shape was caused by magnetic field increased Dexter energy transfer rate.In this letter, we presented a method to study the MFEs on the triplets in phosphorescent OLEDs. The magnetic electroluminescence (MEL) was obtained by doping a red phosphorescent guest with low concentration into a fluorescent host, where the guest and host can simultaneously emit. Experimentally two different MEL shapes of Lorentz and linear were observed, depending on the used host materials. We presented two different mechanisms to explain their difference. The diffusion process of triplets from host to guest and prolonged lifetime of triplet by magnetic field were attributed to the formation of the Lorentz shape, and it is considered that the linear shape was caused by magnetic field increased Dexter energy transfer rate and determined by the triplet energy difference between guest and host. It can be seen that the competition of two processes lead to the formation of the two different MEL shapes in the phosphorescent OLEDs.