Autors: Aleksandrova, M. P., Dobrikov, G. H., G. D. Kolev., Cholakova, I. N.
Title: Improvement of the injection efficiency in organic light emitting devices by additional spray deposited hole transporting layer
Keywords: Organic light emitting devices, Hole transporting layer, Injection efficiency, Spray deposition, Organic thin films

Abstract: Novel approach for deposition of thin films from low molecular weight compounds by pulverization is presented. The method was supplied for preparation of flexible organic light emitting device with tris(8-quinolinolato)-aluminum (Alq3) emissive layer. Additional film of N-N′-diphenyl-N-N′-bis (1-naphthyl)-1,1′-biphenyl-4,4′-diamine (NPB) was also spray deposited as a hole transporting layer (HTL) to increase the injection efficiency of the organic electroluminescent structure. Suitable substrate temperature was set to avoid dissolving and damage of both layers, caused by solvent penetration from NPB in Alq3. After optimization of the deposition conditions and because of the energy level alignment with introduction of NPB, it was measured reduction of the turn-on voltage with approximately 2 V. Current-voltage characteristics show 6 mA higher current at given voltage for the structure with HTL and the brightness-voltage characteristics show that the emission intensity is 300 cd/m2 high

References

    Issue

    Journal of Science and Engineering, vol. 1, issue 1, pp. 79-83, 2013, United States,

    Вид: статия в списание, публикация в издание с импакт фактор