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Keywords:

  • Charge insertion;
  • Hybrid materials;
  • Nanocrystals;
  • Organic light-emitting diodes;
  • Polymers

Abstract

A relatively high-efficiency, fluorescent pure-white organic light-emitting diode was fabricated using a polysilicic acid (PSA) nanodot-embedded polymeric hole-transporting layer (HTL). The diode employed a mixed host in the single emissive layer, which comprised 0.5 wt % yellow 5,6,11,12-tetra-phenylnaphthacene doped in the mixed host of 50 % 2-(N,N-diphenyl-amino)-6-[4-(N,N-diphenylamino)styryl]naphthalene and 50 % N,N′-bis-(1-naphthyl)-N,N′-diphenyl-1,10-biphenyl-4-4′-diamine. By incorporating 7 wt % 3 nm PSA nanodot into the HTL of poly(3,4-ethylene-dioxythiophene)-poly-(styrenesulfonate), the efficiency at 100 cd m–2 was increased from 13.5 lm W–1 (14.7 cd A–1; EQE: 7.2 %) to 17.1 lm W–1 (17.6 cd A–1; EQE: 8.3 %). The marked efficiency improvement may be attributed to the introduction of the PSA nanodot, leading to a better carrier-injection-balance.