The DC drived EL devices have been prepaired by means of conventional vacuum vapour deposition. The emitting material of these devices is Rhodamine (R6G) doped organic chelate dye 8-hydroxyquinoline aluminium (Alq3). The wavelength of devices changed from Alq3's 523urn to 575urn. Moreover

a doped Alq3 thin film whose emission colour is different from undoped Alq3 emitting layer was used as a "sensing layer".The spectra and

I-V

character were measured and the emission zone

interface effect

energy transfer mechanism and other fundamental problen of luninescence were discussed.