Synthesis and application of thiadiazoloquinoxaline-containing chromophores as dopants for efficient near-infrared organic light-emitting diodes

Qian Gang, Zhong Ze, Luo Min, Yu Dengbin, Zhang Zhiqiang, Ma Dongge, Yuan Wang Zhi

Research output: Contribution to journalArticlepeer-review

90 Scopus citations

Abstract

A series of a donor-acceptor-donor type of near-infrared (NIR) fluorescent chromophores based on [1,2,5]thiadiazolo[3,4-g]quinoxaline (TQ) as an electron acceptor and triphenylamine as an electron donor are synthesized and characterized. By introducing pendent phenyl groups or changing the p-conjugation length in the TQ core, we tuned the energy levels of these chromophores, resulting in the NIR emission in a range from 784 to 868 nm. High thermal stability and glass transition temperatures allow these chromophores to be used as dopant emitters, which can be processed by vapor deposition for the fabrication of organic lightemitting diodes (OLEDs) having the multilayered structure of ITO/MoO 3/NPB/Alq 3:dopant emitter/BCP/ Alq 3/LiF/Al. The electroluminescence spectra of the devices based on these new chromophores cover a range from 748 to 870 nm. With 2 wt % of dopant 1, the LED device shows an exclusive NIR emission at 752 nm with the external quantum efficiency (EQE) as high as 1.12% over a wide range of current density (e.g., around 200 mA cm -2). The radiance reaches the largest value of 2880 mW Sr -1 m -2 at an operating voltage of 15 V.

Original languageEnglish (US)
Pages (from-to)1589-1595
Number of pages7
JournalJournal of Physical Chemistry C
Volume113
Issue number4
DOIs
StatePublished - Jan 29 2009
Externally publishedYes

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