Solid-state, white light-emitting electrochemical cells (LECs) based oil a fluorene-oxadiazole copolymer have been Successfully demonstrated. The copolymer has a pi-conjugated backbone consisting of 75 mol % fluorene and 25 mol % 5,5'-diphenyl-2,2'-bi-1,3,4-oxadiazole. 2-(2-(2-Methoxyethoxy)ethoxy)ethyl attached on the 9-C of the fluorenes was introduced to promote ionic conductivity necessary for the operation of LECs. The copolymer, synthesized by Suzuki coupling reactions, has a number-average molecular weight of 8700 and polydispersity of 2.41. The LECs were fabricated by spin-coating the copolymer admixed with lithium trifluoromethanesulfonate onto indium-tin oxide (ITO) Substrate coated with poly(ethylenedioxythiophene)-poly(styrenesulfonic acid) (PEDOT:PSS). The opposite electrode was vapor evaporated aluminum. The LEC devices showed a white electroluminescence with CIE coordinates of (0.24, 0.31). The emission spectrum consisted of emissions front both the individual polymer chains and excimers. The white LECs are promising for solid-state lighting devices with a simple device structure and low-cost fabrication.