Efficient electron-transporting materials (ETMs) are critical to achieving excellent performance of organic light-emitting diodes (OLEDs), yet developing such materials remains a major long-term challenge, particularly ETMs with high electron mobilities (μ_eles). Herein, we report a short conjugated ETM molecule (PICN) with a dipolar phenanthroimidazole group, which exhibits an electron mobility of up to 2.03×10^-4 cm²/(V·s). The origin of this high μ_ele is a long-ranged, regulated special cage-like interactions with C-H···N radii, which is also favorable for the excellent efficiency stability and operational stability in OLED. It is worth noting that the green phosphorescent OLED operation half-lifetimes can reach up 630 h under unencapsulated, which is 20 times longer than the commonly used commercial ETM TPBi OLEDs.