Adam Bickerdike, Roderick C. I. Mackenzie, Mujeeb U. Chaudhry
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Unravelling the Spatiotemporal Exciton Dynamics in Electrically Pumped Organic Laser Diodes
Organic materials offer wide‐band emission covering regions of the spectrum unachievable by conventional semiconductors. If electrically pumped lasing could be demonstrated using these materials, many new classes of optical sensors and detectors could be realized leaving a profound impact on society. Devices fabricated from conducting molecules and polymers have already been demonstrated with polaron densities higher than those which theoretically lead to lasing action; however, threshold remains elusive. Herein, a polymer micro‐OLED is reported that achieves record room‐temperature current densities of 1.5 , however despite this, it is not high enough to reach lasing threshold. Using a combination of nanosecond spectrographic techniques and detailed simulation, the mechanisms inhibiting lasing action is unraveled. It is shown that although as previously thought singlet‐triplet annihilation is important in pushing threshold higher, photon absorption by excited triplets is as (if not more) important in inhibiting lasing action. The complex dynamics of singlets, triplets, and free/excited polarons in these disordered materials are visualized; establishing a pathway to overcome these bottlenecks and realise electrically pumped organic lasing action.
期刊介绍:
Laser & Photonics Reviews is a reputable journal that publishes high-quality Reviews, original Research Articles, and Perspectives in the field of photonics and optics. It covers both theoretical and experimental aspects, including recent groundbreaking research, specific advancements, and innovative applications.
As evidence of its impact and recognition, Laser & Photonics Reviews boasts a remarkable 2022 Impact Factor of 11.0, according to the Journal Citation Reports from Clarivate Analytics (2023). Moreover, it holds impressive rankings in the InCites Journal Citation Reports: in 2021, it was ranked 6th out of 101 in the field of Optics, 15th out of 161 in Applied Physics, and 12th out of 69 in Condensed Matter Physics.
The journal uses the ISSN numbers 1863-8880 for print and 1863-8899 for online publications.