Results 11 to 20 of about 51 (44)
Introducing MR‐TADF emitters into Light‐Emitting Electrochemical Cells for narrowband and efficient emission [PDF]
Advanced Functional Materials, Volume 33, Issue 42, October 13, 2023., 2023 The Umeå University authors wish to acknowledge generous financial support from the Swedish Research Council, the Swedish Energy Agency, Bertil och Britt Svenssons stiftelse för belysningsteknik, Länsstyrelsen Västerbotten, Kempestiftelserna, Olle ...
Ludvig Edman +13 more
core +2 more sources
Efficiency Roll-Off in Light-Emitting Electrochemical Cells
Advanced Materials, Volume 36, Issue 15, April 11, 2024.Understanding “efficiency roll-off” (i.e., the drop in emission efficiency with increasing current) is critical if efficient and bright emissive technologies are to be rationally designed. Emerging light-emitting electrochemical cells (LECs) can be cost-
Ràfols-Ribé, J. +15 more
core +2 more sources
Carbon Dots: A Review with Focus on Sustainability. [PDF]
Adv Sci (Weinh)Carbon dots (CDs) are an emerging class of optical nanomaterials, which can deliver function on par with the incumbents, while being free from toxic metals and critical raw materials. In particular, CDs derived from plentiful biomass can become truly sustainable, provided that their synthesis and processing are environmentally friendly.
Ren J, Opoku H, Tang S, Edman L, Wang J.
europepmc +2 more sources
Angewandte Chemie, Volume 135, Issue 23, June 5, 2023., 2023 The solid‐state nanomorphology that enables aggregation‐induced emission (AIE) is shown to be compatible with the ion redistribution that defines the operation of light‐emitting electrochemical cells (LECs), and appropriately designed AIE‐LECs are reported to deliver fast‐to‐turn and efficient emission at low voltage.
Shi Tang +8 more
wiley +2 more sources
Advanced Materials Technologies, Volume 8, Issue 13, July 10, 2023., 2023 A method for the in situ determination of the orientation of the emissive dipoles in light‐emitting electrochemical cells (LECs) is reported. It reveals that ≈95% of the dipoles remain oriented parallel to the device plane during long‐term operation in a common polymer LEC.
Joan Ràfols‐Ribé +4 more
wiley +1 more source
Advanced Functional Materials, Volume 32, Issue 44, October 26, 2022., 2022 Light‐emitting electrochemical cells (LECs) that emit by the process of thermally activated delayed fluorescence (TADF) can be truly sustainable, but their blue emission performance is unfortunately poor. Here, a TADF‐LEC is developed, which delivers strong blue emission with a luminance of 740 cd m–2 at a record‐high external quantum efficiency of 5.0%
Shi Tang +7 more
wiley +1 more source
Controlling the Emission Zone by Additives for Improved Light‐Emitting Electrochemical Cells
Advanced Materials, Volume 34, Issue 8, February 24, 2022., 2022 The position of the in situ formed emission zone (EZ) in light‐emitting electrochemical cells has a profound influence on the device performance because of microcavity effects and doping and electrode quenching. This study shows that the inclusion of easily tuned additives can rationally shift the EZ position for improved performance.
Joan Ràfols‐Ribé +8 more
wiley +1 more source
Advanced Electronic Materials, Volume 7, Issue 8, August 2021., 2021 The entire light‐emitting electrochemical cell can be fabricated with cost‐efficient printing, but an overlooked issue is that the electrode/active‐material interfaces become open for ion transfer. This study shows that the employment of a spray‐coated poly(3,4‐ethylenedioxythiophene):poly(styrene‐sulfonate) (PEDOT:PSS) anode results in that a majority
Etienne Auroux +6 more
wiley +1 more source
Advanced Optical Materials, Volume 9, Issue 7, April 6, 2021., 2021 Rationally designed host–guest light‐emitting electrochemical cells can achieve high efficiency at strong luminance but have suffered from poor stability. This study reveals that a major culprit is the propensity of the n‐type host to crystallize, and it addresses this issue through the identification of an amorphous host that results in much‐improved ...
Shi Tang +4 more
wiley +1 more source
Advanced Optical Materials, Volume 9, Issue 6, March 18, 2021., 2021 In this work the synthesis and application of a porphyrin compound in near‐infrared light‐emitting electrochemical cells (LECs) is described. The emitter shows a strong tendency to form aggregates, which can be alleviated by blending into a “compatible” host polymer.
Mariza Mone +12 more
wiley +1 more source