Li, Qing published the artcileSolution-processible Thieno-[3,4-b]-pyrazine Derivatives with Large Stokes Shifts for Non-doped Red Light-emitting Diodes, Product Details of C4Br2N2O4S, the publication is Macromolecular Rapid Communications (2011), 32(9-10), 736-743, database is CAplus and MEDLINE.
A group of novel thieno-[3,4-b]-pyrazine-cored mols. containing polyphenyl dendrons with or without arylamino or carbazolyl surface groups (DTP, N-DTP and C-DTP) are synthesized and investigated. They are characterized by extra large Stokes shifts of over 250 nm. In addition, to provide the site-isolation effect on the planar emissive core, the bulky dendrons enable these mols. to be solution processible. The peripheral carbazolyl or arylamino units facilitate the hole transporting ability in the neat films of these mols. These dendritic materials are used as a non-doped emitting layer to fabricate organic light-emitting diodes (OLEDs) using a spin coating technique and saturated red emission is obtained. The dendritic mols. with arylamino or carbazolyl surface groups (N-DTP and C-DTP) exhibit a brightness of 1020 cd m-2 and a luminous efficiency of 0.6 cd A-1, both higher than the dendritic analog without the surface functional groups (DTP), even superior to the small mol. reference compound which fails to transmit pure red emission under identical conditions. This performance is also comparable with that from vacuum deposited thieno-[3,4-b]-pyrazine-based counterparts and that for some other solution processible red fluorescent dendrimers. This is the first example of solution processible thieno-[3,4-b]-pyrazine derivatives for OLED applications.
Macromolecular Rapid Communications published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Product Details of C4Br2N2O4S.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary