Abstract
Several hole transport molecules ( N, N′-diphenyl- N, N′-(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine; 4,4-bis[ N-(1-naphthyl)- N-phenylamino]biphenyl; 4,4′,4″-tris[ N-(1-naphthyl)- N-phenylamino]triphenylamine (TNATA); MTDATA) are blue light emitters [SPIE 3797 (1999) 120]. Realisation of monolayer structures is very easy but their performances are too weak. To improve them, we have built some multilayer structures with electron transport layer (tris(8-hydroxyquinolinate) aluminium (Alq 3); bis(10-hydroxybenzo(h)quinolinate) beryllium (Bebq 2)) and a bathocuproine (BCP) layer to confine the radiative recombinations in the hole transport layer. To improve hole injection, we inserted poly(3,4-ethylenedioxythiophene) (PEDOT) layer between the indium–tin-oxide anode and the hole transporting layer. The best results are obtained with the four-layer structure PEDOT/TNATA/BCP/Bebq 2 (λ=508 nm) , luminance=5500 cd/m 2 at 10.2 V.
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