-
1 week ago | 
advanced.onlinelibrary.wiley.com | Haonan Zhao |Sritoma Paul |Stephen R. Forrest
1 Introduction Phosphorescent organic light-emitting devices (PHOLEDs) have revolutionized display and lighting technologies, yet stable PHOLEDs with near-unity quantum efficiency in the deep blue remain unavailable.[1] A unity internal quantum efficiency (IQE) requires harvesting triplet exciton radiation,[2, 3] such as by using heavy-metal phosphors[2, 4] or thermally activated delayed fluorescence[5, 6] (TADF).
-
1 month ago | 
nature.com | Claire Arneson |Stephen R. Forrest
AbstractBlue phosphorescent organic light-emitting diodes (PHOLEDs) are highly efficient, although their short operational lifetimes have limited their commercial acceptance in displays and lighting. A high density of energetic triplet excitons accumulates in the emission layer that eventually annihilate, leading to molecular degradation.
-
Nov 14, 2024 | 
link.aps.org | Haonan Zhao |Boning Qu |Stephen R. Forrest
Phosphorescent organic light-emitting devices (PHOLEDs) suffer from destructive molecular processes due to triplet-polaron and triplet-triplet annihilation.
-
Sep 5, 2024 | 
nature.com | Lingxiao Zhou |Yang Lu |Qiuyang Li |Nathanial Lydick |Kenji Watanabe |Takashi Taniguchi | +1 more
AbstractFloquet engineering is a promising tool to manipulate quantum systems coherently. A well-known example is the optical Stark effect, which has been used for optical trapping of atoms and breaking time-reversal symmetry in solids. However, as a coherent nonlinear optical effect, Floquet engineering typically requires high field intensities obtained in ultrafast pulses, severely limiting its use.
-
Aug 29, 2024 | 
onlinelibrary.wiley.com | Haonan Zhao |Stephen R. Forrest
1 Introduction Many attributes of phosphorescent organic light emitting diodes (PHOLEDs), such as a high internal quantum efficiency, wide color gamut, and accurate color rendering are desirable for both display and lighting applications.[1-3] Because white light is generated by exciting a combination of red, green, and blue emitting molecules, it is necessary for the lifetime of each element to be stable and importantly, comparable such that the color quality of the device does not...
-
Jun 10, 2024 | 
link.aps.org | Noel C. Giebink |Stephen R. Forrest
Abstract Trap-mediated recombination influences the performance of a wide range of electronic devices.
-
Oct 6, 2023 | 
nature.com | Qiuyang Li |Jiaqi Hu |Nathanial Lydick |Stephen R. Forrest
Correction to: Nature Communications https://doi.org/10.1038/s41467-023-37500-1, published online 01 April 2023In the “Acknowledgements” section of the original version of this Article, the grant number relating to the Gordon and Betty Moore Foundation was incorrectly given as N031710 and should have been GBMF10694. This has now been corrected in both the PDF and HTML versions of the Article.
-
Aug 21, 2023 | 00348-x&sz=64)
cell.com | Xinjing Huang |Yongxi Li |Stephen R. Forrest
Highlights • Dipolar molecules result in reduced device reliability of organic photovoltaics • Dipolar molecules tend to reorganize and reorient during device operation • Dipolar reorganization leads to increased dielectric constant and reduced performance Summary Blending two non-fullerene acceptors (NFAs) to form bulk heterojunctions (BHJs) in ternary organic photovoltaics (OPVs) has been shown to lead to an end-capping exchange reaction that results in the generation of several new dipolar...
-
Jul 19, 2023 | 
pubs.acs.org | Jie Ma |Jonas Schaab |Stephen R. Forrest |Sritoma Paul
CCDC 2206141, 2206146, 2216906, 2216913, and 2233511 contain the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk/data_request/cif, or by emailing [email protected], or by contacting The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: +44 1223 336033. Terms & Conditions Most electronic Supporting Information files are available without a subscription to ACS Web Editions.
-
Jun 29, 2023 | 
link.aps.org | Noel C. Giebink |Stephen R. Forrest
Abstract We derive the thermodynamic limit for organic light-emitting diodes (OLEDs), and show that strong exciton binding in these devices requires a higher voltage to achieve the same luminance as a comparable inorganic LED. The OLED overpotential, which does not reduce the power conversion efficiency, is minimized by having a small exciton binding energy, a long exciton lifetime, and a large Langevin coefficient for electron-hole recombination.
