Strategic tuning of excited-state properties of electroluminescent materials with enhanced hot exciton mixing.

Deep blue emitters with excellent stability, high quantum yield and multifunctionality are the major issues for full-color displays. In line with this, new multifunctional, thermally stable blue emitters , -(4-(10-(1-(2,3-dihydrobenzo[][1,4]dioxin-6-yl)-1-phenanthro[9,10-]imidazol-2-yl)anthracen-9-yl)phenyl)--phenylbenzenamine (DPIAPPB) and 2-(10-(9-carbazol-9-yl)anthracen-9-yl)-1-(2,3-dihydrobenzo[][1,4]dioxin-6-yl)-1-phenanthro[9,10-]imidazole (CADPPI) with hybridized local charge transfer state (HLCT) and hot exciton properties have been synthesized. These molecules show high photoluminescence quantum yield ( ): (DPIAPPB - 0.

Derivatives of Cyanonaphthyl-Substituted Phenanthroimidazole as Blue Emitters for Nondoped Organic Light-Emitting Diodes.

New multifunctional blue-emissive materials with superior thermal properties, viz., 4,4'-bis(1-(4-naphthyl)-1-phenanthro[9,10-]imidazol-2-yl)binaphthyl (NPIBN), 4,4'-bis(1-(4-cyanonaphthyl)-1-phenanthro[9,10-]imidazol-2-yl)biphenyl (CNPIBP), and 4,4'-bis(1-(4-cyanonaphthyl)-1-phenanthro[9,10-]imidazol-2-yl)binaphthyl (CNPIBN) have been synthesized. The said molecules show high photoluminescence quantum yield (Φ: NPIBN-0.

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

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 ( ), 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 (: 13 955 cd m, : 4.

Tailoring the molecular design of twisted dihydrobenzodioxin phenanthroimidazole derivatives for non-doped blue organic light-emitting devices.

Three fused polycyclic aryl fragments, namely, naphthyl, methoxynaphthyl, and pyrenyl have been used to construct blue-emissive phenanthroimidazole-functionalized target molecules, , 1-(2,3-dihydrobenzo[][1,4]dioxin-6-yl)-2-(naphthalen-1-yl)-1-phenanthro[9,10-]imidazole (1), 1-(2,3-dihydrobenzo[][1,4]dioxin-6-yl)-2-(1-methoxynaphthalen-4-yl)-1-phenanthro[9,10-]imidazole (2), and 1-(2,3-dihydrobenzo[][1,4]dioxin-6-yl)-2-(pyren-10-yl)-1-phenanthro[9,10-]imidazole (3). The up-conversion of triplets to singlets a triplet-triplet annihilation (TTA) process is dominant in these compounds due to 2 > . The pyrenyl dihydrobenzodioxin phenanthroimidazole (3)-based nondoped OLED exhibits blue emission (450 nm) with CIE (0.