Zobrazeno 1 - 10
of 219
pro vyhledávání: '"Ian P. Howard"'
Publikováno v:
Scientific Reports, Vol 12, Iss 1, Pp 1-14 (2022)
Abstract A significant impediment to the deployment of anti-counterfeiting technologies is the reliance on specialized hardware. Here, anti-counterfeiting labels are developed that are both excited and detected using a smartphone. The persistent lumi
Externí odkaz:
https://doaj.org/article/a1ca7490423c43ce83ffe1cc11427467
Autor:
Jan C. Fischer, Chun Li, Sebastian Hamer, Lars Heinke, Rainer Herges, Bryce S. Richards, Ian A. Howard
Publikováno v:
Advanced Materials Interfaces, Vol 10, Iss 11, Pp n/a-n/a (2023)
Abstract For optoelectronic applications of metal–organic framework (MOF) thin films, it is important to be able to fabricate films and heterostructures that are highly oriented relative to the substrate's surface normal. However, process optimizat
Externí odkaz:
https://doaj.org/article/55e7c9f59601428aa79ed80635347e28
Comparison of Quantum Yield of Upconversion Nanocrystals Determined by Absolute and Relative Methods
Autor:
Eduard Madirov, Dmitry Busko, Fernando Arteaga Cardona, Damien Hudry, Sergey V. Kuznetsov, Vasilii A. Konyushkin, Andrey N. Nakladov, Alexander A. Alexandrov, Ian A. Howard, Bryce S. Richards, Andrey Turshatov
Publikováno v:
Advanced Photonics Research, Vol 4, Iss 2, Pp n/a-n/a (2023)
Photoluminescence quantum yield (ϕ) is a key parameter of any luminescent material. There are two main ways to determine this value: 1) absolute, which requires calculation of the number of emitted and absorbed photons; and 2) relative, which utiliz
Externí odkaz:
https://doaj.org/article/7725ff0b305148588b4d328c20b4b8f5
Publikováno v:
Frontiers in Chemistry, Vol 10 (2022)
The effect of triplet-triplet annihilation (TTA) on the room-temperature phosphorescence (RTP) in metal-organic frameworks (MOFs) is studied in benchmark RTP MOFs based on Zn metal centers and isophthalic or terephthalic acid linkers (ZnIPA and ZnTPA
Externí odkaz:
https://doaj.org/article/12a219f362de48fcb8073e4cd9a8147f
Publikováno v:
Advanced Photonics Research, Vol 3, Iss 6, Pp n/a-n/a (2022)
Unclonable anticounterfeiting labels can be based on micrometer‐scale randomness created by stochastic processes like the distribution of luminescent microparticles in a transparent layer. Adding a microlens array to the layer can simplify the hard
Externí odkaz:
https://doaj.org/article/520eb84554b34ebba8081063ec9c6e23
Experimental validation of a modeling framework for upconversion enhancement in 1D-photonic crystals
Autor:
Clarissa L. M. Hofmann, Stefan Fischer, Emil H. Eriksen, Benedikt Bläsi, Christian Reitz, Deniz Yazicioglu, Ian A. Howard, Bryce S. Richards, Jan Christoph Goldschmidt
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-10 (2021)
A theoretical framework to optimize photonic structure designs for upconversion enhancement is lacking. Here, the authors present a comprehensive theoretical model and confirm the model’s predictions by experimental realisation of 1D-photonic upcon
Externí odkaz:
https://doaj.org/article/b235bdce09354701bc5fc98611efd63f
Autor:
Taizo Masuda, Kai Aoyagi, Stephan Dottermusch, Ian A. Howard, Bryce S. Richards, Masamori Endo
Publikováno v:
Advanced Photonics Research, Vol 3, Iss 2, Pp n/a-n/a (2022)
Optical gain of 8.3 km−1 is obtained in a neodymium‐doped silica fiber under simulated sunlight (intensity = 2.1 kW m−2). The fiber gain medium (length = 50 m) is coiled and attached to a solid‐state luminescent solar concentrator (LSC) disk
Externí odkaz:
https://doaj.org/article/20a3c462de1040739eea7f721a355d48
Autor:
Sylvia Terbeck, Chloe Case, Joshua Turner, Victoria Spencer, Alison Bacon, Charles Howard, Ian S Howard
Publikováno v:
PLoS ONE, Vol 17, Iss 5, p e0268191 (2022)
Assessing levels of aggression-specifically reactive violence-has been a challenge in the past, since individuals might be reluctant to self-report aggressive tendencies. Furthermore, experimental studies often lack ecological validity. Immersive Vir
Externí odkaz:
https://doaj.org/article/9ef2ac26ac02448894f9ea1ae2b34624
Autor:
Milian Kaiser, Yang Li, Isabel Allegro, Bryce S. Richards, Ulrich Wilhelm Paetzold, Ian A. Howard
Publikováno v:
Advanced Materials Interfaces, Vol 8, Iss 24, Pp n/a-n/a (2021)
Abstract Optical excitation of quasi‐2D perovskites leads to excited‐state populations of excitons, free charge carriers, or a mixture of both, depending on the type and amount of 2D spacer used. The fluence dependence of three quantities: 1) the
Externí odkaz:
https://doaj.org/article/59146f524fdb4074b95314d8a868b94c
Autor:
Sebastian Hamer, Fynn Röhricht, Marius Jakoby, Ian A. Howard, Xianghui Zhang, Christian Näther, Rainer Herges
Publikováno v:
Beilstein Journal of Organic Chemistry, Vol 15, Iss 1, Pp 1331-1338 (2019)
We report the synthesis of five dicarboxylic acid-substituted dipolar molecular rotors for the use as linker molecules in metal-organic frameworks (MOFs). The rotor molecules exhibit very low rotational barriers and decent to very high permanent, cha
Externí odkaz:
https://doaj.org/article/482e078e63f8488b8d7c73abec899db0