Boosting Efficiency of Near‐Infrared Emitting Iridium(III) Phosphors by Administrating Their π–π Conjugation Effect of Core–Shell Structure in Solution‐Processed OLEDs

Abstract Nano-sized lanthanum hexaboride (LaB6)@ titanium dioxide (TiO2) particles with a core–shell structure has been successfully synthesized via a simple sol–gel method. LaB6@TiO2 particles were used as filler in polyvinyl butyral (PVB) matrix and performance of the TiO2 shell was evaluated. The core–shell nanoparticles were characterized for morphology and structure properties. X-ray diffraction and transmission electron microscope testing results confirm the formation of LaB6–TiO2 core–shell structure. In composite film, LaB6 improved the thermo-decomposing temperature of PVB matrix from 369.2 to 372.8°C, while the same amount of LaB6@TiO2 further increased the temperature to 381.0°C. In addition, TiO2 shell redshifted the maximum transmittance of the film from 605 to 669 nm in the visible region. In the near infrared region, its absorption peak shifted from 1,466 to 1,476 nm. This result will be helpful for the development of transparent and thermal insulating materials.

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Detecting Core-Shell Structure Formation Using near Infrared Spectroscopy

Journal of Near Infrared Spectroscopy ◽

10.1255/jnirs.613 ◽

2006 ◽

Vol 14 (3) ◽

pp. 179-187 ◽

Cited By ~ 11

Author(s):

Marcelo K. Lenzi ◽

Enrique L. Lima ◽

José Carlos Pinto

Keyword(s):

Infrared Spectroscopy ◽

Structure Formation ◽

Near Infrared Spectroscopy ◽

Shell Structure ◽

Near Infrared ◽

Core Shell ◽

Core Shell Structure

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Low temperature solution-processed high performance photodiode based on Si–ZnO core–shell structure

Physical Chemistry Chemical Physics ◽

10.1039/c3cp43083a ◽

2013 ◽

Vol 15 (14) ◽

pp. 4970 ◽

Cited By ~ 5

Author(s):

Dong Liu ◽

Xiaojuan Shen ◽

Tao Song ◽

Jia Hu ◽

Baoquan Sun

Keyword(s):

Low Temperature ◽

Shell Structure ◽

High Performance ◽

Core Shell ◽

Solution Processed ◽

Temperature Solution ◽

Core Shell Structure

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Mesoporous Silica-Coated Upconverting Nanorods for Singlet Oxygen Generation: Synthesis and Performance

Materials ◽

10.3390/ma14133660 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3660

Author(s):

Zhen Zhang ◽

Xiao-Lian Zhang ◽

Bin Li

Keyword(s):

Photodynamic Therapy ◽

Mesoporous Silica ◽

Singlet Oxygen ◽

Rose Bengal ◽

Shell Structure ◽

Near Infrared ◽

Core Shell ◽

Sio2 Shell ◽

Mesoporous Sio2 ◽

Core Shell Structure

Photodynamic therapy (PDT) has been reported as a possible pathway for the treatment of tumors. The exploration for promising PDT systems thus attracts continuous research efforts. This work focused on an ordered core–shell structure encapsulated by mesoporous SiO2 with the upconverting emission property following a surfactant-assisted sol–gel technique. The mesoporous silica shell possessed a high surface area-to-volume ratio and uniform distribution in pore size, favoring photosensitizer (rose bengal) loading. Simultaneously, upconverting nanocrystals were synthesized and used as the core. After modification via hydrophobic silica, the hydrophobic upconverting nanocrystals became hydrophilic ones. Under near-infrared (NIR) light irradiation, the nanomaterials exhibited strong green upconverting luminescence so that rose bengal could be excited to produce singlet oxygen. The photodynamic therapy (PDT) feature was evaluated using a 1O2 fluorescent indicator. It was found that this core–shell structure generates 1O2 efficiently. The novelty of this core–shell structure was the combination of upconverting nanocrystals with a mesoporous SiO2 shell so that photosensitizer rose bengal could be effectively adsorbed in the SiO2 shell and then excited by the upconverting core.

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