Low Light Amplification Threshold and Reduced Efficiency Roll-Off in Thick Emissive Layer OLEDs from a Diketopyrrolopyrrole Derivative

Atul Shukla, Volter Entoma, Sarah K.M. McGregor, Monirul Hasan, Masashi Mamada, Evan G. Moore, Chihaya Adachi, Shih Chun Lo, Ebinazar B. Namdas

Research output: Contribution to journalArticlepeer-review

Abstract

External quantum efficiency (EQE) roll-off under high current injection has been one of the major limiting factors toward the development of organic semiconductor laser diodes (OSLDs). While significant progress in this regard has been made on organic semiconductors (OSCs) emitting in the blue–green region of the visible spectrum, OSCs with longer wavelength emission (>600 nm) have fallen behind in both material development and the advancement in device architectures suitable for the realization of OSLDs. Therefore, to make simultaneous incremental advancements, a host–guest system comprising of a high performing poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT) polymer and an efficient small molecule laser dye, dithiophenyl diketopyrrolopyrrole (DT-DPP), is used. This combination provides an extremely low amplified spontaneous emission threshold of 4.2 µJ cm−2 at an emission wavelength of 620 nm. The solution-processed organic light-emitting diodes (OLEDs) fabricated using this system exhibit a high external quantum efficiency (EQE) of 2.6% with low efficiency roll-off and high current injection up to 90 A cm−2 to yield ultrahigh luminance of over 1.5 million cd m−2.

Original languageEnglish
JournalMacromolecular rapid communications
DOIs
Publication statusAccepted/In press - 2022

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Low Light Amplification Threshold and Reduced Efficiency Roll-Off in Thick Emissive Layer OLEDs from a Diketopyrrolopyrrole Derivative'. Together they form a unique fingerprint.

Cite this