Design of conjugated molecular materials for optoelectronics

Abstract

Fluorescent metal complexes and dimers have been synthesized and used for organic light-emitting diodes. The metal complexes with conjugated molecular ligands have strong photoluminescence, and showed bright emission of over 10 000 cd m 22 in bilayer electroluminescent (EL) cells. The EL cell structure was [transparent anode/hole-transport layer/emitting layer/cathode]. The newly synthesized pyrazoline dimers are also highlȳ uorescent, and they have hole-transport tendency. Therefore, another type of structure [transparent anode/ emitting layer/electron-transport layer/cathode] was applied to get emission from the pyrazoline derivatives. As a result, one pyrazoline derivative showed bright blue EL of 1700 cd m 22 at the maximum when it was combined with an oxadiazole electron-transport material.

Fabrication of Sb3+sensor based on 1,1′-(-(naphthalene-2,3-diylbis(azanylylidene))bis(methanylylidene))bis(naphthalen-2-ol)/nafion/glassy carbon electrode assembly by electrochemical approach

“…9 These properties are mainly due to the imine group present in Schiff bases, which could also be altered by varying the substituents in the molecules. [10][11][12] Furthermore, several studies have explored the properties of Schiff bases as catalysts, [13][14][15][16] uorescent materials, [17][18][19] electroluminescent materials, [20][21][22] etc. Since Schiff bases are known by their strong coordinative ability as a family of ligands, with the formation in most cases of 1 : 1 transition metal complexes, 23 they have been used to develop various chemosensors.…”

The effect of fluorination on the luminescent behaviour of 8-hydroxyquinoline boron compounds

“…7-12, 16, 17 Another approach has been the use of different central metal atoms. 13,17,18 Boronbased compounds of the type R 2 BQ (including many variations on Q) have attracted a great deal of attention as emitting materials due to their increased stability compared to aluminium-based emitters and the strong -electron accepting behaviour of the empty p z orbital at the boron centre. 19,20 In OLED devices, boron-based compounds have mostly been investigated as emissive or electron transporting materials, but only a few devices have shown peak EL intensities greater than 2500 cd/m 2 .…”

Organic Light Emitting Diodes Based on Novel Zn and Al Complexes

“…Among these materials, Zn complexes have been especially important because of the simplicity in synthesis procedures and wide spectral response. Extensive research work is going on in various laboratories to synthesize new Zn complexes containing new ligands to produce a number of novel luminescent Zn complexes as emitters and electron transporters (Sapochak et al, 2001(Sapochak et al, , 2002Hamada et al, 1996;Sano et al, 2000;Kim et al, 2007;Rai et al, 2008). Zinc(II) bis[2-(2-hydroxyphenyl) benzothiazole] (Zn(BTz) 2 ) has been studied as an effective white light emissive and electron transporting material in OLED.…”