Results 61 to 70 of about 36,694 (225)

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

Yb₂-Tb Upconversion in a Hetero-Trimetallic Molecular Lanthanide Complex. [PDF]

Angew Chem Int Ed Engl
Lanthanides are at the forefront of photon upconversion in molecular systems; however, the chemical nature of the lanthanides makes site‐specific coordination chemistry difficult to achieve. Here, we employ kinetically stabile building blocks to achieve hetero‐trimetallic 4f complexes with complete site‐specific chemical control.
Kofod N, Thornton ME, Richardson A, Smith C, Gurung S, Parkinson P, Faulkner S, Hay S, Natrajan LS.   +8 more
europepmc   +2 more sources

Upconversion of optical signals with multi-longitudinal-mode pump lasers

, 2012
Multi-longitudinal-mode lasers have been believed to be good candidates as pump sources for optical frequency conversion. However, we present a semi-classical model for frequency conversion of optical signals with a multimode pump laser, which shows that
G.-L. Shentu, J. S. Pelc, J. W. Goodman, Jian-Wei Pan, M. M. Fejer, Q. Zhang, R. Loudon   +6 more
core   +1 more source

Charge Transfer States in Donor–Acceptor Bulk‐Heterojunctions as Triplet–Triplet Annihilation Sensitizer for Solid‐State Photon Upconversion

Advanced Materials Interfaces, EarlyView.
A near‐infrared photosensitizer that facilitates efficient solid‐state photon upconversion by recycling triplets formed within a fullerene‐based donor–acceptor bulk‐heterojunction system is demonstrated. Spectroscopic investigations reveal that the energy of photogenerated charge transfer states of triplet character (3CT) is subsequently transferred to
Maciej Klein, Alexander R. Ireland, Evan G. Moore, Dennis Delic, Ajay K. Pandey   +4 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

Sub-quadratic dependence of visible upconversion on infra-red direct luminescence decay owing to static energy-transfer upconversion [PDF]

, 2002
Because of their broadband luminescence, TM-ion-doped materials are of high interest for applications as tunable and short-pulse lasers. Systems with a d1 electron configuration possess only one excited 3d level and excited-state absorption into higher ...
Fedosseev, R.V., Limberger, H.G., Pollnau, M.   +2 more
core   +2 more sources

Light‐Programmable Interfaces: From Molecular Photoswitching to Adaptive Membrane Separations

Advanced Materials Interfaces, EarlyView.
This review advances an interface‐centered framework for light‐responsive membranes, linking molecular photoswitches (azobenzene (AZO), spiropyran (SP), diarylethene (DAE), donor–acceptor Stenhouse adducts (DASA), photoacid) to integration strategies in polymeric, porous, self‐assembled, and mixed‐matrix systems.
Liangliang Zhang, Senlin Gu, Jianyang Zhao, Xiaojuan Hao, Lu Hua Li, Jihua Li, Lingxue Kong   +6 more
wiley   +1 more source

Anomalously bright single-molecule upconversion electroluminescence

Nature Communications
Efficient upconversion electroluminescence is highly desirable for a broad range of optoelectronic applications, yet to date, it has been reported only for ensemble systems, while the upconversion electroluminescence efficiency remains very low for ...
Yang Luo, Fan-Fang Kong, Xiao-Jun Tian, Yun-Jie Yu, Shi-Hao Jing, Chao Zhang, Gong Chen, Yang Zhang, Yao Zhang, Xiao-Guang Li, Zhen-Yu Zhang, Zhen-Chao Dong   +11 more
doaj   +1 more source

Nd-doped aluminum oxide integrated amplifiers at 880 nm, 1060 nm, and 1330 nm [PDF]

, 2010
Neodymium-doped Al2O3 layers were deposited on thermally oxidized Si substrates and channel waveguides were patterned using reactive-ion etching. Internal net gain on the Nd3+ transitions at 880, 1064, and 1330 nm was investigated,\ud yielding a maximum ...
Ay, F., Dalfsen, K. van, Pollnau, M., Wörhoff, K., Yang, J.   +4 more
core   +1 more source