High-efficiency deep blue fluorescent emitters based on phenanthro[9,10-d]imidazole substituted carbazole and their applications in organic light emitting diodes

Efficient OLEDs Fabricated by Solution Process Based on Carbazole and Thienopyrrolediones Derivatives

“…For instance, devices based on G3MP (A3 and B3) [ 21 ] have a maximum EQE of 12.8% and 10.3%, respectively, both with their EML as host/guest type. M2 [ 49 ] and B [ 50 ] devices with only the carbazole derivative as emitter (like our devices) have a maximum EQE 3.0% and 3.6% respectively (with EL emission around the deep blue). OLEDs with better performance have maximum EQE of 20.1% and 14.4% for DCZ-TTR [ 34 ] and CZ-TTR [ 34 ] respectively, using as EML a host/guest type; they showed similar EL emission, however, such devices have low operation voltage and low current densities values.…”

“…When comparing the reached results for our OLEDs devices based on CZ-2 and CZ-1 as EML with those reported in the literature, it can be observed that these measured current efficiencies of 19.3 cd/A and 20.2 cd/A, respectively, are in general similar (or even larger) than those for other OLEDs using also compounds derived from carbazole as emitter material, see Table 2 . For instance: M2 [ 49 ], B [ 50 ] and CP3 [ 32 ] (by spin coating as well as by evaporation), have current efficiencies of 1.53 cd/A (at 4543 cd/m 2 ), 1.8 cd/A (and maximum luminance up to 2267 cd/m 2 ) and 2.53 cd/A (with maximum luminance up to 8235 cd/m 2 ), respectively. This trend was because these OLEDs had larger current densities compared to those for our devices.…”

π‐Conjugated Indole Dyads with Strong Blue Emission Made Possible by Stille Cross‐Coupling and Double Fischer Indole Cyclisation

“…They can be classified based on generic scaffolds including anthracene, phenanthrene, imidazole, triphenylamine and carbazole motifs ,. While a large number of such molecules has been developed, the increased demand in cost‐effective blue‐emitting materials for OLEDs commercialisation highlighted a necessity of rational design and sustainable synthetic strategies to achieve the full potential of these technological applications . Indoles are electron‐rich small aromatic heterocycles widely occurring in nature.…”

Synthesis and photophysical properties of novel multisubstituted benzene and naphthalene derivatives with high 2D-π-conjugation

“…Nowadays, especially valuable are the blue light emitters, due to the fact that by mixing with a suitable dopant it is possible to obtain OLED's any desired color. For instance, the white light emission was achieved by mixing two ''complementary lights'' as long as the connection line of their coordinates lies across the white light region [8]. However, it should be emphasized that blue light is the high energetic one (3 eV, approximately).…”