In:
Materials Horizons, Royal Society of Chemistry (RSC)
Kurzfassung:
Organic upconversion devices (UCDs) are the cutting-edge technology and hot topic because of their low-cost and convenient advantages in important applications of near-infrared (NIR) detection and imaging. However, for realizing utilization of triplet excitons (T1), the previous UCDs are in trouble with heavy relying on toxic and costly heavy metal doped emitters. More importantly, due to poor performance of detecting unit and/or emitting unit, their detectivity (D*) and photon-to-photon conversion efficiency (ηp-p) are still a challenge for real application. Here, we report a high-performance dual-functional pure organic UCD that has an outstanding D* approaching 10 13 Jones and a high ηp-p of 20.1% in NIR region, which are one of the highest values among reported UCDs. The high performance is credited to excellent D* of detecting unit exceeding 10 14 Jones and is also attributed to efficient T1 utilization via dual reverse intersystem crossing channel and high optical out coupling achieved by high horizontal dipole ratio in emitting unit. The high D* and ηp-p enable the UCD to detect 850 nm light low to 0.29 μW/cm2 and display with high contrast over 70000:1, significantly improving potential for practical applications of UCDs in NIR detecting and imaging. Besides, high speed rise time and fall time of 8.9 and 14.8 μs are also achieved. Benefiting from the high performance, consequently, applications of low-power pulse state monitoring and fine structure bio-imaging are successfully realized with high quality by using our organic UCDs. These results demonstrate that our design not only eliminates dependence of UCD on heavy metal emitters, but also takes their performance and application to a high level.
Materialart:
Online-Ressource
ISSN:
2051-6347
,
2051-6355
Sprache:
Englisch
Verlag:
Royal Society of Chemistry (RSC)
Publikationsdatum:
2023
ZDB Id:
2744250-0
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