Speaker: Atul Shukla
Affiliation: University of Queensland

Abstract

Organic semiconductors have the ability to show efficient electroluminescent (EL) characteristics and can also provide light amplification under optical excitation. However, even after decades of extensive research, realisation of electrically pumped organic lasers has been a difficult task. This is primarily due to the excessive build-up of triplet excitons under electrical excitation leading to disproportionate ratio between the population of triplet and singlet excitons. While these triplet excitons are by themselves non-emissive, they also lead to non-radiative depletion of singlet excitons by process known as singlet-triplet annihilation. In this talk I will discuss about technique that can aid towards constructive use of triplet excitons and present results that show light amplification under optical pumping and EL external quantum efficiency (EQE) of ~8% which exceeds the theoretical spin statistical limit of 5%  as described for typical fluorescent organic semiconductors.

About Physics Seminars

The weekly Physics Seminar series focuses on a broad range of physics research within SMP, along with frequent presentations from visiting researchers. Seminars are usually scheduled for 1.00pm on Tuesdays.

The talks are typically more specialised than a colloquium but are often attended by staff and PhD students across a broad range of areas. Speakers are thus encouraged to include introductory material in the talks.

All SMP researchers and HDR students are encouraged to speak. Please email Tyler Neely to register your interest.

The seminars are open so there is no need to register your attendance.

Previous recorded physics seminars 

Venue

Zoom address:
https://uqz.zoom.us/j/94116861984