Results 61 to 70 of about 22,469 (293)

Recent Advances in Light‐Addressable Electrochemistry for Spatially Resolved Applications

Advanced Materials Technologies, EarlyView.
This comprehensive review highlights light‐addressable electrochemistry as a powerful tool that uses light to control localized chemical reactions on unstructured semiconductor surfaces. The work evaluates advanced strategies to optimize electrode materials for enhanced spatial resolution and stability. Furthermore, it showcases diverse applications in
Nhi Trang Vo, Sina Jamali, Nam‐Trung Nguyen   +2 more
wiley   +1 more source

Hydrothermal Synthesis and Properties of Yb³⁺/Tm³⁺ Doped Sr₂LaF₇ Upconversion Nanoparticles

Nanomaterials, 2022
We report the procedure for hydrothermal synthesis of ultrasmall Yb3+/Tm3+ co-doped Sr2LaF7 (SLF) upconversion phosphors. These phosphors were synthesized by varying the concentrations of Yb3+ (x = 10, 15, 20, and 25 mol%) and Tm3+ (y = 0.75, 1, 2, and 3
Bojana Milićević, Jovana Periša, Zoran Ristić, Katarina Milenković, Željka Antić, Krisjanis Smits, Meldra Kemere, Kaspars Vitols, Anatolijs Sarakovskis, Miroslav D. Dramićanin   +9 more
doaj   +1 more source

Photophysics of Upconversion: Towards Application in Upconversion Displays

, 2020
Der Regenbogen besteht aus sieben Farben. Von Violett nach Rot, nimmt die Photonenenergie des Lichts ab. Durch die Kombination der Energien von zwei roten Photonen kann ein blaues Photon erzeugt werden. Ein solcher Prozess wird als Upconversion (UC) bezeichnet. UC kann in organischen und anorganischen Systemen beobachtet werden.
openaire   +2 more sources

An Examination of the Cs2NaInCl6 Luminescence: Interplay of Self‐Generated In+ and Doped Sb3+, Er3+/Yb3+ Ions

Advanced Optical Materials, EarlyView.
A new luminescence mechanism in Cs2NaInCl₆ is revealed through spontaneously formed In3+→In+ centers and Er3+/Yb3+/Sb3+ doping. Tunable visible, near‐infrared, downconversion, and upconversion emissions are demonstrated, while DFT calculations explain the electronic structure.
Inna A. Ivashchenko, Alicja Szymska‐Szymanik, Lubomir D. Gulay, Alexander Eich, Galina Gurieva, Susan Schorr, Karina V. Lamonova, Marcin Nyk, Malgorzata Makowska‐Janusik, Benjamin González‐Diaze, Katarzyna Matras‐Postołek   +10 more
wiley   +1 more source

Comparison of Quantum Yield of Upconversion Nanocrystals Determined by Absolute and Relative Methods

Advanced Photonics Research, 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 utilizes ...
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   +10 more
doaj   +1 more source

Optical Properties and Concentration Quenching Mechanism of Er³⁺ Heavy Doped Gd₂(MoO₄)₃ Phosphor for Green Light-Emitting Diode

Nanomaterials, 2022
Upconversion materials capable of converting low-energy excitation photons into high-energy emission photons have attracted considerable interest in recent years.
Dongyu Li, Bing Xu, Zhen Huang, Xiao Jin, Zhenghe Zhang, Tingting Zhang, Deng Wang, Xuping Liu, Qinghua Li   +8 more
doaj   +1 more source

Smart Nanotechnologies for Multimodal Neuromodulation and Brain Interfacing

Advanced Science, EarlyView.
Recent advances in smart nanotechnologies are expanding the toolbox for brain interfacing, from wireless neuromodulation and high‐resolution sensing to targeted delivery within the central nervous system. By combining responsive nanomaterials with bioinspired design, these platforms enable multimodal interactions with neurons and glia, while also ...
Tommaso Curiale, Marie Celine Lefevre, Alessio Carmignani, Maria Cristina Ceccarelli, Matteo Battaglini, Attilio Marino, Gianni Ciofani   +6 more
wiley   +1 more source

Enabling Photon Upconversion and Precise Control of Donor–Acceptor Interaction through Interfacial Energy Transfer

Advanced Science, 2018
Upconverting materials have achieved great progress in recent years, however, it remains challenging for the mechanistic research on new upconversion strategy of lanthanides.
Bo Zhou, Long Yan, Lili Tao, Nan Song, Ming Wu, Ting Wang, Qinyuan Zhang   +6 more
doaj   +1 more source

Blue upconversion thulium laser [PDF]

, 1990
Upconversion has been an active area of research for at least two decades, mainly because of its wide ranging applications from infrared quantum counters, visible-emitting phosphors, to upconversion lasers.
Nguyen, D. C., Dulick, M., Michael E. Weber, George E. Faulkner, Michael Dulick, Dinh C. Nguyen, Faulkner, G. E., Weber, M. E.   +7 more
core   +1 more source

Polydopamine Nanoparticle‐Mediated Precise Near‐Infrared Optical Stimulation for Cognitive Enhancement

Advanced Science, EarlyView.
Polydopamine nanoparticles enable a precise, non‐genetic, and transcranial neuromodulation strategy via near‐infrared photothermal stimulation. By activating TRPV1 channels, this approach specifically enhances hippocampal gamma oscillations, thereby rescuing spatial memory deficits in models of perioperative neurocognitive disorder.
Yan‐Bo Zhou, Qiong Xue, Su‐Xuan Hou, Ke‐Yao Zhang, Wei‐Tong Pan, Ting‐Ting Zeng, Yu‐Ge Wang, Daqing Ma, Chenguang Zhao, Pan‐Miao Liu, Jian‐Jun Yang   +10 more
wiley   +1 more source