A Dithienylbenzothiadiazole Pure Red Molecular Emitter with Electron Transport and Exciton Self‐Confinement for Nondoped Organic Red‐Light‐Emitting Diodes

Abstract

International audience<p>An amorphous photoluminescent material based on a dithienylbenzothiadiazole structure has been used for the fabrication of organic red-light-emitting diodes. The synergistic effects of the electron-transport ability and exciton confinement of the emitting material allow for the fabrication of efficient pure-red-light-emitting devices without a hole blocker.</p

Recent Developments in the Synthesis and Applications of 1,2,5-Thia- and Selenadiazoles. A Review

“…275 Efficient red-light-emitting systems with benzothiadiazole, benzoselenadiazole, and naphthothiadiazole moieties were created and proposed as candidates for non-doping redemitting diodes. 45,105,164,226,240,276 They showed high brightness, current efficiency, and excellent color purity. Some examples are shown in Figure 16.…”

Electroluminescence and Laser Emission of Soluble Pure Red Fluorescent Molecular Glasses Based on Dithienylbenzothiadiazole

“…The low efficiency of device D1 could be attributed to a lack of charge confinement. [11,21] The incorporation of an electron-blocking PVK layer in device D2 produces a fourfold increase of the maximum luminous efficiency up to 2.1 cd A À1 , corresponding to h ext of 2.74%. This value ranks among the highest reported so far for this type of device (see SI).…”

“…It is worth noting that, unlike many red light-emitting materials in which hole-transport is generally predominant in the solid state, compound 1a was shown to exhibit hole-injection and electrontransporting properties. [11] Soluble thermally and morphologically stable conjugated semiconducting fluorophores have been shown to be promising active materials for low-cost organic solid-state lasers. [12][13][14] Whereas blue organic lasers have been frequently investigated, [12,14] organic lasers based on solution-processed red emitting dye molecules remain largely unexplored.…”

Organic solution-processible electroluminescent molecular glasses for non-doped standard red OLEDs with electrically stable chromaticity

“…Unfortunately, its voltage chromatic stability is not studied, which is a very important issue for practical application of voltage/current-driven OLEDs, especially for red electroluminescent emitters. The voltage chromatic stability of red emitters, not only red electroluminescent polymers but also red electroluminescent organic small molecules [18][19][20][21][22][23], is difficultly achieved especially for non-doped red emitters [24][25][26][27][28][29][30][31][32] since their molecular structures usually bear a large conjugated system or push-pull characteristics derived from the donor and acceptor moieties, which will result in a strong p-p stacking or intermolecular static interaction. Out of question, it is more difficult to achieve non-doped standard red OLEDs with voltage chromatic stability from solution-processible OEMGs.…”