Synthesis and Structure−Property Relationships of Soluble Rigid−Flexible Copolyethers Containing Blue and Yellow Light Emitting Units

2000 ◽  
Vol 12 (10) ◽  
pp. 2957-2963 ◽  
Author(s):  
F. D. Konstandakopoulou ◽  
S. M. Iconomopoulou ◽  
K. G. Gravalos ◽  
J. K. Kallitsis
Keyword(s):  
Structure Property ◽  
Yellow Light ◽  
Light Emitting ◽  
Structure Property Relationships

Catalyst Halogenation Enables Rapid and Efficient Polymerizations with Visible to Near-Infrared Light

2020 ◽  
Author(s):  
Alex Stafford ◽  
Dowon Ahn ◽  
Emily Raulerson ◽  
Kun-You Chung ◽  
Kaihong Sun ◽  
...  
Keyword(s):  
Near Infrared ◽  
Transient Absorption ◽  
Reaction Times ◽  
Infrared Light ◽  
Structure Property ◽  
Light Emitting ◽  
Structure Property Relationships ◽  
Nir Light ◽  
Light Intensities ◽  
Emission Quenching

Driving rapid polymerizations with visible to near-infrared (NIR) light will enable nascent technologies in the emerging fields of bio- and composite-printing. However, current photopolymerization strategies are limited by long reaction times, high light intensities, and/or large catalyst loadings. Improving efficiency remains elusive without a comprehensive, mechanistic evaluation of photocatalysis to better understand how composition relates to polymerization metrics. With this objective in mind, a series of methine- and aza-bridged boron dipyrromethene (BODIPY) derivatives were synthesized and systematically characterized to elucidate key structure-property relationships that facilitate efficient photopolymerization driven by visible to NIR light. For both BODIPY scaffolds, halogenation was shown as a general method to increase polymerization rate, quantitatively characterized using a custom real-time infrared spectroscopy setup. Furthermore, a combination of steady-state emission quenching experiments, electronic structure calculations, and ultrafast transient absorption revealed that efficient intersystem crossing to the lowest excited triplet state upon halogenation was a key mechanistic step to achieving rapid photopolymerization reactions. Unprecedented polymerization rates were achieved with extremely low light intensities (< 1 mW/cm<sup>2</sup>) and catalyst loadings (< 50 μM), exemplified by reaction completion within 60 seconds of irradiation using green, red, and NIR light-emitting diodes.

Structure−Property Relationships in Light-Emitting Polymers:  Optical, Electrochemical, and Thermal Studies

2000 ◽  
Vol 33 (20) ◽  
pp. 7426-7430 ◽  
Author(s):  
Min Zheng ◽  
Ananda M. Sarker ◽  
E. Elif Gürel ◽  
Paul M. Lahti ◽  
Frank E. Karasz
Keyword(s):  
Thermal Studies ◽  
Structure Property ◽  
Light Emitting ◽  
Structure Property Relationships

scholarly journals Catalyst Halogenation Enables Rapid and Efficient Polymerizations with Visible to Near-Infrared Light

2020 ◽  
Author(s):  
Alex Stafford ◽  
Dowon Ahn ◽  
Emily Raulerson ◽  
Kun-You Chung ◽  
Kaihong Sun ◽  
...  
Keyword(s):  
Near Infrared ◽  
Transient Absorption ◽  
Reaction Times ◽  
Infrared Light ◽  
Structure Property ◽  
Light Emitting ◽  
Structure Property Relationships ◽  
Nir Light ◽  
Light Intensities ◽  
Emission Quenching

Driving rapid polymerizations with visible to near-infrared (NIR) light will enable nascent technologies in the emerging fields of bio- and composite-printing. However, current photopolymerization strategies are limited by long reaction times, high light intensities, and/or large catalyst loadings. Improving efficiency remains elusive without a comprehensive, mechanistic evaluation of photocatalysis to better understand how composition relates to polymerization metrics. With this objective in mind, a series of methine- and aza-bridged boron dipyrromethene (BODIPY) derivatives were synthesized and systematically characterized to elucidate key structure-property relationships that facilitate efficient photopolymerization driven by visible to NIR light. For both BODIPY scaffolds, halogenation was shown as a general method to increase polymerization rate, quantitatively characterized using a custom real-time infrared spectroscopy setup. Furthermore, a combination of steady-state emission quenching experiments, electronic structure calculations, and ultrafast transient absorption revealed that efficient intersystem crossing to the lowest excited triplet state upon halogenation was a key mechanistic step to achieving rapid photopolymerization reactions. Unprecedented polymerization rates were achieved with extremely low light intensities (< 1 mW/cm<sup>2</sup>) and catalyst loadings (< 50 μM), exemplified by reaction completion within 60 seconds of irradiation using green, red, and NIR light-emitting diodes.

Recent progress in hot exciton materials for organic light-emitting diodes

2021 ◽  
Author(s):  
Yuwei Xu ◽  
Pei Xu ◽  
Dehua Hu ◽  
Yuguang Ma
Keyword(s):  
Recent Progress ◽  
Development Process ◽  
Light Emitting Diodes ◽  
Molecular Design ◽  
Organic Light Emitting Diodes ◽  
Structure Property ◽  
Light Emitting ◽  
Structure Property Relationships ◽  
Organic Light ◽  
Material Systems

The development process, molecular design principles, material systems, structure–property relationships and OLED applications of hot exciton materials are comprehensively summarized.

High Tg small-molecule phenanthroline derivatives as a potential universal hole-blocking layer for high power-efficiency and stable organic light-emitting diodes

2017 ◽  
Vol 5 (9) ◽  
pp. 2329-2336 ◽  
Author(s):  
Xin-Feng Wei ◽  
Wan-Yi Tan ◽  
Jian-Hua Zou ◽  
Qing-Xun Guo ◽  
Dong-Yu Gao ◽  
...  
Keyword(s):  
Power Efficiency ◽  
Organic Light Emitting Diodes ◽  
Blocking Layer ◽  
Structure Property ◽  
Light Emitting ◽  
High Performing ◽  
Structure Property Relationships ◽  
Organic Light ◽  
Hole Blocking Layer ◽  
High Power Efficiency

The molecular structure–property relationships are presented for new series of high-performing hole-blocking phenanthroline compounds.

Synthesis and Structure - Property Relationships of Symmetric Ambipolar Quaterfluorene-Containing Oxadiazole as a Central Core and Diphenylamine as End-capping Moieties

2008 ◽  
Vol 61 (7) ◽  
pp. 541 ◽  
Author(s):  
Fan Yang ◽  
Xiao Ling Zhang ◽  
Mo Jun Xiong ◽  
Zi Jian Cao ◽  
Ping Fang Xia ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Single Layer ◽  
Cross Coupling ◽  
Structure Property ◽  
Electrochemical Stabilities ◽  
Light Emitting ◽  
Structure Property Relationships ◽  
Hole Transporting ◽  
End Capping ◽  
Double Charge

A facile approach for the synthesis of the symmetric ambipolar quaterfluorene, OF(4)OX-NPh, with hole-transporting and electron-transporting moieties by Suzuki cross-coupling as a key reaction has been developed. This novel ambipolar quaterfluorene exhibits high thermal and electrochemical stabilities and is expected to possess potential application as a double charge-transfer and light-emitting material in the field of single-layer organic emitting diodes.

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