Organic pure-blue-light-emitting devices based on terfluorenes compounds

A series of organic pure-blue-light-emitting devices based on terflurorenes (TF) compounds are reported. In these double heterojunctions (DHJ) devices, two TF compounds act as a blue emitter, alternatively. Highly efficient pure-blue emissions are obtained from these devices. The maximum luminous efficiency of 1.52cd∕A (corresponding to an external quantum efficiency of 2.7%) with 1931 Commission International De L’Eclairage coordinates of (0.165, 0.072) is obtained. It is indicated that the DHJ device structure is beneficial to the performance of blue devices by means of effective confinement of excitons and carriers in the large energy gap blue emitter.