A novel blue-light organic electroluminescence material derived from 8-hydroxyquinoline lithium

A novel blue-light organic electroluminescence material (OEM) derived from 8-hydroxyquinoline lithium (Liq), bis[(8-hydroxyquinolin)lithium·8-hydroxyquinolin] sodium ([Liq·q−]2·2Na+), was synthesized and investigated. For stereo molecular structure and presence of sodium ions, [Liq·q−]2·2Na+ exhibits higher quantum yield and longer fluorescence lifetime than Liq. When used as light-emitting layer in organic light-emitting diode (OLED), [Liq·q−]2·2Na+ shows the maximum emission peak at 489 nm in electroluminescence spectra and emits bluer light with higher current efficiency stability than Liq. Moreover, [Liq·q−]2·2Na+ exhibits excellent thermal stability and film formability.