High-Speed OLEDs and Area-Emitting Light-Emitting Transistors from a Tetracyclic Lactim Semiconducting Polymer

Viqar Ahmad, Atul Shukla, Jan Sobus, Anirudh Sharma, Desta Gedefaw, Gunther G. Andersson, Mats R. Andersson, Shihchun Lo, Ebinazar B. Namdas

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Development of a new class of luminescent materials that show high-speed response, high charge carrier mobility, and high brightness is desirable toward realization of next generation of devices, such as electrically pumped organic lasers, visible light communication instruments, and organic light-emitting transistors. In this paper, high-speed organic light-emitting diodes (OLEDs) and high-performance hybrid light-emitting transistors from a new type of solution processable luminescent material, poly[thiophene-2,5-diyl-alt-5,10-bis((2-hexyldecyl)oxy)dithieno[3,2-c:3′,2′-h][1,5]naphthyridine-2,7-diyl] (PTNT), are reported. The OLEDs based on PTNT polymer exhibit a peak brightness of 8 × 105 cd m−2 and 40 MHz modulation frequency under 10 ns pulse operation. This modulation frequency is significantly higher than that of commercially available LEDs, used for visible light communication. Additionally, solution-processed area-emitting hybrid light-emitting transistors with an external quantum yield of 0.25% at brightness of 250 cd m−2 are demonstrated. Finally, the paper provides device physics and optoelectronic properties of PTNT polymer using ultraviolet photon spectroscopy, inversed photoelectron spectroscopy, and photophysical measurements.

Original languageEnglish
Article number1800768
Number of pages8
JournalAdvanced Optical Materials
Issue number21
Early online date15 Aug 2018
Publication statusPublished - 5 Nov 2018


  • high current density
  • high-brightness OLEDs
  • hybrid light-emitting transistors
  • luminescent polymers, pulsed LEDs


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