to balance the charge two chloride anions cl u2212 form ionic bonds with the corresponding ammonium cations u2014 nh 3 the resulting chloride salt c 20 h 22 s 4 n 2 cl 2 or aeqt 2hcl fig1 b is the compound used as an emitting layer in an oled device deposition of the material as a thin film is accomplished by various inexpensive low temperature methods such as spin coating or thermal evaporation in this case a single source thermal ablation technique disclosed in copending u s patent application ser no 09 192 130 to chondroudis et al assigned to the same assignee as this application was employed for the deposition of nominally amorphous thin films the powder x ray diffraction pattern as shown at 1 in fig2 of an as deposited films was almost featureless indicating an amorphous or very fine grained film the same pattern was obtained after thermal annealing at 90 u00b0 c and 135 u00b0 c presumably this is because the molecules in the salt interact via strong ionic interactions as well as through van der waals forces the stronger bonding is expected to impede rearrangement of the dye molecules during and after thin film deposition for comparison the aeqt dye was evaporated without converting it to a salt as shown at 2 in fig2.