Room temperature phosphorescence and delayed fluorescence of organic molecules trapped in silica sol—gel glasses

1991 ◽  
Vol 57 (1-3) ◽  
pp. 41-63 ◽  
Author(s):  
David Levy ◽  
David Avnir
Keyword(s):  
Room Temperature ◽  
Organic Molecules ◽  
Sol Gel ◽  
Delayed Fluorescence ◽  
Silica Sol ◽  
Room Temperature Phosphorescence ◽  
Gel Glasses

scholarly journals Thermally activated delayed fluorescence with a narrow emission spectrum and organic room temperature phosphorescence by controlling spin–orbit coupling and phosphorescence lifetime of metal-free organic molecules

2018 ◽  
Vol 6 (20) ◽  
pp. 5434-5443 ◽  
Author(s):  
Piotr Pander ◽  
Agnieszka Swist ◽  
Radoslaw Motyka ◽  
Jadwiga Soloducho ◽  
Fernando B. Dias ◽  
...  
Keyword(s):  
Room Temperature ◽  
Organic Molecules ◽  
Delayed Fluorescence ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Room Temperature Phosphorescence ◽  
Phosphorescence Lifetime ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Narrow Emission

A novel acridone derivative is presented showing TADF and narrow blue electroluminescence.

scholarly journals Regioisomeric Effect on the Excited-State Fate Leading to Room-Temperature Phosphorescence or Thermally Activated Delayed Fluorescence in a Dibenzophenazine-Cored Donor–Acceptor–Donor System

2021 ◽  
Author(s):  
Takumi Hosono ◽  
Nicolas Oliveira Decarli ◽  
Paola Zimmermann Crocomo ◽  
Tsuyoshi Goya ◽  
Leonardo Evaristo de Sousa ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Delayed Fluorescence ◽  
Quantum Yields ◽  
Room Temperature Phosphorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Donor Acceptor ◽  
Emission Behavior

Exploring design principle for switching thermally activated dealyed fluorescecne (TADF) and room temperature phosphorescence (RTP) is a fundamentally imporant research in developing triplet-mediated photofunctional organic materials. Herein systematic studies on the regioisomeric and substituents effects in a twisted donor–acceptor–donor (D–A–D) scaffold (A = dibenzo[a,j]phenazine; D = dihydrophenazasiline) on the fate of the excited state have been performed. The study revealed that the regiosiomerism clearly affects the emission behavior of the D–A–D compounds. Distinct difference in TADF, dual TADF & RTP, and dual RTP were observed, depending on the host used. Furthermore, OLED organic light-emitting diodes (OLEDs) fabricated with the developed emitters achieved high external quantum yields for RTP-based OLEDS up to 7.4%.

Enhancement of Uranyl Adsorption Capacity and Selectivity on Silica Sol−Gel Glasses via Molecular Imprinting

1997 ◽  
Vol 9 (11) ◽  
pp. 2521-2525 ◽  
Author(s):  
Sheng Dai ◽  
Y. S. Shin ◽  
C. E. Barnes ◽  
L. M. Toth
Keyword(s):  
Adsorption Capacity ◽  
Molecular Imprinting ◽  
Sol Gel ◽  
Silica Sol ◽  
Gel Glasses

Silicon dioxide nanotubes prepared by anodic alumina as templates

2000 ◽  
Vol 15 (2) ◽  
pp. 387-392 ◽  
Author(s):  
Ming Zhang ◽  
Y. Bando ◽  
K. Wada
Keyword(s):  
Silicon Dioxide ◽  
Aging Time ◽  
Room Temperature ◽  
Sol Gel ◽  
Silica Sol ◽  
Anodic Alumina ◽  
Template Method ◽  
Nanochannel Array ◽  
Inside Wall ◽  
Dipping Time

Aligned slicon dioxide nanotubes with diameters of 30–40 nm synthesized by the sol-gel template method are presented. This process involves the growth of nanotubes from ordered nanochannel-array pores in anodic alumina. For a silica sol aged at room temperature and dipped for 1 min, nanowires were formed in a shorter period of aging time (2 days); nanotubes connecting with solid nanofibers were obtained in a longer aging time (30 days). The formation of nanotubes depends strongly on the temperature of the sol. For a short dipping time (<1 min), bamboolike nanofibers were prepared when the sol was at high temperature (50 °C); however, perfect nanotubes with the sharp wall were synthetized for the lower sol temperature (5 °C). The lower sol temperature is, the smoother the inside wall of nanotubes is. It is proved that viscosity plays an important role on the morphology of nanotubes.

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