A novel cross-linkable red iridium(III) complex and electron transport material were designed and synthesized for use in the fabrication of solution-processed phosphorescent organic light-emitting diodes (PHOLEDs). The newly cross-linkable red Ir(III) complex was successfully thermal cross-linked with a cross-linkable host in the emitting layer (EML). After cross-linking, the EML was found not to be damaged by organic solvents. A maximum external quantum efficiency (EQE) of 4.64% (2.77 cd A⁻¹) was achieved for deep-red PHOLEDs after rinsing, which was similar to the EQE of 4.59% (2.52 cd A⁻¹) after rinsing the deep-red PHOLEDs with thermal cross-linking.