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A series of efficient blue-emitting materials, namely, Cz-DPVI, Cz-DMPVI, Cz-DEPVI and TPA-DEPVI, possessing a donor-acceptor architecture with dual carrier transport properties and small singlet-triplet splitting is reported. These compounds exhibit excellent thermal properties with a very high glass-transition temperature ( T  g ), and thus, a stable uniform thin film was formed during device fabrication. Among the weak donor compounds, specifically, Cz-DPVI, Cz-DMPVI and Cz-DEPVI, the Cz-DEPVI-based device showed the maximum efficiencies ( L : 13 955 cd m -2 , η  ex : 4.90%, η  c : 6.0 cd A -1 , and η  p : 5.4 lm W -1 ) with CIE coordinates of (0.15, 0.06) at 2.8 V. The electroluminescent efficiencies of Cz-DEPVI were higher than that of the strong donor TPA-DEPVI-based device ( L : 13 856 cd m -2 , η  ex : 4.70%, η  c : 5.7 cd A -1 , and η  p : 5.2 lm W -1 ). Furthermore, these blue emissive materials were used as hosts to construct efficient green and red phosphorescent OLEDs. The green device based on Cz-DEPVI:Ir(ppy) 3 exhibited the maximum L of 8891 cd m -2 , η  ex of 19.3%, η  c of 27.9 cd A -1 and η  p of 33.4 lm W -1 with CIE coordinates of (0.31, 0.60) and the red device based on Cz-DEPVI:Ir(MQ) 2 (acac) exhibited the maximum L of 40 565 cd m -2 , η  ex of 19.9%, η  c of 26.0 cd A -1 and η  p of 27.0 lm W -1 with CIE coordinates of (0.64, 0.37).

rsc advances

Efficient full-colour organic light-emitting diodes based on donor–acceptor electroluminescent materials with a reduced singlet–triplet splitting energy gap