Thermally stable multilared organic electroluminescent devices using novel starburst molecules, 4,4′,4″‐Tri(N‐carbazolyl)triphenylamine (TCTA) and 4,4′,4″‐Tris(3‐methylphenylphenylamino)triphenylamine (m‐MTDATA), as hole‐transport materials

Organic electroluminescent devices with improced thermal stability and good performance characteristics are reported. The hole‐transport material is a novel π‐electron “starburst” molecule, TCTA (see Figure), whose glass‐transition temperature is increased by the introduction of a structurally rigid moiety. magnified image