Perfluorinated Acenes: Crystalline Phases, Polymorph-Selective Growth, and Optoelectronic Properties

2021 ◽  
Author(s):  
Daniel Bischof ◽  
Marc Zeplichal ◽  
Sebastian Anhäuser ◽  
Akshai Kumar ◽  
Martin Kind ◽  
...  
Keyword(s):  
Selective Growth ◽  
Optoelectronic Properties ◽  
Crystalline Phases

Selective Growth of Self-Assembling Si and SiGe Quantum Dots

2014 ◽  
Vol E97.C (5) ◽  
pp. 393-396
Author(s):  
Katsunori MAKIHARA ◽  
Mitsuhisa IKEDA ◽  
Seiichi MIYAZAKI
Keyword(s):  
Quantum Dots ◽  
Selective Growth ◽  
Self Assembling

Hydrothermal Synthesis and Solid-State Laser Refrigeration of Ytterbium-Doped Potassium Lutetium Fluoride (KLF) Microcrystals

2020 ◽  
Author(s):  
Xiaojing Xia ◽  
Anupum Pant ◽  
Xuezhe Zhou ◽  
Elena Dobretsova ◽  
Alex Bard ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Solid State ◽  
Information Science ◽  
Point Group ◽  
Solid State Laser ◽  
Lanthanide Ions ◽  
Group Symmetry ◽  
Luminescence Spectra ◽  
Crystalline Phases ◽  
State Laser

Fluoride crystals, due to their low phonon energies, are attractive hosts of trivalent lanthanide ions for applications in upconverting phosphors, quantum information science, and solid-state laser refrigeration. In this article, we report the rapid, low-cost hydrothermal synthesis of potassium lutetium fluoride (KLF) microcrystals for applications in solid-state laser refrigeration. Four crystalline phases were synthesized, namely orthorhombic K<sub>2</sub>LuF<sub>5</sub> (Pnma), trigonal KLuF<sub>4</sub> (P3<sub>1</sub>21), orthorhombic KLu<sub>2</sub>F<sub>7</sub> (Pna2<sub>1</sub>), and cubic KLu<sub>3</sub>F<sub>10</sub> (Fm3m), with each phase exhibiting unique microcrystalline morphologies. Luminescence spectra and emission lifetimes of the four crystalline phases were characterized based on the point-group symmetry of trivalent cations. Laser refrigeration was measured by observing both the optomechanical eigenfrequencies of microcrystals on cantilevers in vacuum, and also the Brownian dynamics of optically trapped microcrystals in water. Among all four crystalline phases, the most significant cooling was observed for 10%Yb:KLuF<sub>4</sub> with cooling of 8.6 $\pm$ 2.1 K below room temperature. Reduced heating was observed with 10%Yb:K<sub>2</sub>LuF<sub>5</sub>

Conjugated Organic Cations to Improve the Optoelectronic Properties of 2D/3D Perovskites

2019 ◽  
Author(s):  
Eva M. Barea ◽  
Jesús Rodríguez-Romero ◽  
Bruno Clasen Hames ◽  
Iván Mora-Seró
Keyword(s):  
Optoelectronic Properties ◽  
Organic Cations

Structural and Optoelectronic Properties of Polycrystalline CdS Thick Film Prepared by Screen Printing

2018 ◽  
Vol 10 (5) ◽  
pp. 05018-1-05018-4
Author(s):  
B. Y. Bagul ◽  
◽  
P. S. Sonawane ◽  
A. Z. Shaikh ◽  
Y. N. Rane ◽  
...  
Keyword(s):  
Thick Film ◽  
Screen Printing ◽  
Optoelectronic Properties ◽  
Structural And Optoelectronic Properties
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