Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 김동하 | * |
dc.date.accessioned | 2017-08-25T05:08:09Z | - |
dc.date.available | 2017-08-25T05:08:09Z | - |
dc.date.issued | 2017 | * |
dc.identifier.issn | 1530-6984 | * |
dc.identifier.other | OAK-20875 | * |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/235702 | - |
dc.description.abstract | Organo-metal halide perovskites are a promising platform for optoelectronic applications in view of their excellent charge-transport and bandgap tunability. However, their low photoluminescence quantum efficiencies, especially in low-excitation regimes, limit their efficiency for light emission. Consequently, perovskite light-emitting devices are operated under high injection, a regime under which the materials have so far been unstable. Here we show that, by concentrating photoexcited states into a small subpopulation of radiative domains, one can achieve a high quantum yield, even at low excitation intensities. We tailor the composition of quasi-2D perovskites to direct the energy transfer into the lowest-bandgap minority phase and to do so faster than it is lost to nonradiative centers. The new material exhibits 60% photoluminescence quantum yield at excitation intensities as low as 1.8 mW/cm2, yielding a ratio of quantum yield to excitation intensity of 0.3 cm2/mW; this represents a decrease of 2 orders of magnitude in the excitation power required to reach high efficiency compared with the best prior reports. Using this strategy, we report light-emitting diodes with external quantum efficiencies of 7.4% and a high luminescence of 8400 cd/m2. © 2017 American Chemical Society. | * |
dc.language | English | * |
dc.publisher | American Chemical Society | * |
dc.subject | energy transfer | * |
dc.subject | Light-emitting diodes | * |
dc.subject | Monte Carlo | * |
dc.subject | Perovskites | * |
dc.subject | photoluminescence quantum yield | * |
dc.subject | Quasi-2D perovskites | * |
dc.title | Tailoring the Energy Landscape in Quasi-2D Halide Perovskites Enables Efficient Green-Light Emission | * |
dc.type | Article | * |
dc.relation.issue | 6 | * |
dc.relation.volume | 17 | * |
dc.relation.index | SCIE | * |
dc.relation.index | SCOPUS | * |
dc.relation.startpage | 3701 | * |
dc.relation.lastpage | 3709 | * |
dc.relation.journaltitle | Nano Letters | * |
dc.identifier.doi | 10.1021/acs.nanolett.7b00976 | * |
dc.identifier.wosid | WOS:000403631600056 | * |
dc.identifier.scopusid | 2-s2.0-85020721167 | * |
dc.author.google | Quan L.N. | * |
dc.author.google | Zhao Y. | * |
dc.author.google | García De Arquer F.P. | * |
dc.author.google | Sabatini R. | * |
dc.author.google | Walters G. | * |
dc.author.google | Voznyy O. | * |
dc.author.google | Comin R. | * |
dc.author.google | Li Y. | * |
dc.author.google | Fan J.Z. | * |
dc.author.google | Tan H. | * |
dc.author.google | Pan J. | * |
dc.author.google | Yuan M. | * |
dc.author.google | Bakr O.M. | * |
dc.author.google | Lu Z. | * |
dc.author.google | Kim D.H. | * |
dc.author.google | Sargent E.H. | * |
dc.contributor.scopusid | 김동하(26039227400) | * |
dc.date.modifydate | 20240123104500 | * |