The electroluminescence (EL) produced by a highly luminescent phosphorescent dye Cu-4(CdropCPh)(4)L-2 (L = 1.8-bis(di-phenylphosphino)-3,6-dioxaoctane, Cu-4) doped polymer as emitting layer is reported. The effects of...The electroluminescence (EL) produced by a highly luminescent phosphorescent dye Cu-4(CdropCPh)(4)L-2 (L = 1.8-bis(di-phenylphosphino)-3,6-dioxaoctane, Cu-4) doped polymer as emitting layer is reported. The effects of the charge injection balance on the polymers, in particular, poly(N-vinylcarbazole) (PVK) have been studied by using photoluminescence and electroluminescence spectroscopy. Changes in the emission spectra demonstrate the influence of the charge injection balance on the formation ratio of triplet and singlet excitons. This provides a new technical approach to realize the color patterning in polymer LEDs.展开更多
The optical properties of three linear conjugated oligomers （F-P, F-P-F, and P-F-P-F-P）, where phenothiazine （P） and fluorene （F） groups arrange alternately, are investigated. With the enhancement of the π-conj...The optical properties of three linear conjugated oligomers （F-P, F-P-F, and P-F-P-F-P）, where phenothiazine （P） and fluorene （F） groups arrange alternately, are investigated. With the enhancement of the π-conjugated system, their absorption and emission bands both gradually red shift, and their two-photon properties are also improved. Meanwhile, their fluorescence dynamic traces are analyzed with continuous rate distribution model, exhibiting that their decay rates gradually accelerate and the rate distribution width become narrower. The quantum chemical calculation offers their molecular structures and transition mechanism, showing that the enhancement of π-conjugated system should be responsible for tile improvement of two-photon properties.展开更多
Electrodeposition is an old and effective method for the fabrication of organic films.Though electrodeposited organic films have been widely used in various applications,highly luminescent films have been a great chal...Electrodeposition is an old and effective method for the fabrication of organic films.Though electrodeposited organic films have been widely used in various applications,highly luminescent films have been a great challenge because the electrochemically doped state may strongly quench the fluorescence.In the first part of this review,the organic electrodeposition techniques,along with general electropolymerization and other special electrodepositions are introduced.In the second part of the review,we describe how to electrochemically fabricate luminescent films for organic light-emitting diodes(OLEDs).With the rational molecular design and well-controlled electrodeposition process,we have not only demonstrated high-performance OLEDs,but also paved a promising way to practice active-matrix OLEDs(AMOLEDs)and super-resolution OLEDs.In particular,RGB 3×3 array OLEDs based on active-matrix substrates,RGB passive-matrix OLEDs(PMOLEDs)with a resolution of 210 ppi,and monochromatic OLEDs with a super-resolution of 2822 ppi have been successfully fabricated.It is highly anticipated that the organic electrodeposition technology is of comparable or perhaps even higher contenders in manufacturing and downscaling OLEDs and AMOLEDs with low-cost and high-resolution for the human-computer interaction fields such as augmented reality(AR),virtual reality(VR),etc.展开更多
As two pivotal functional segments,triazine and porphyrin can be coupled to form a highly cross-linked conjugated polymer.Although the obtained conjugated polymers are almost insoluble in most solvents,a small amount ...As two pivotal functional segments,triazine and porphyrin can be coupled to form a highly cross-linked conjugated polymer.Although the obtained conjugated polymers are almost insoluble in most solvents,a small amount of protonic acid can cause the formation of a colloidal solution of polymers.The dissolution process has proved to be a surface charge effect induced by protonation of porphyrin units in the polymer framework.High-quality conjugated polymer films have been prepared on diverse substrates by solution drop-casting and then used for thermoelectric(TE)applications.The films exhibit remarkable TE performance with high Seebeck coefficients(−6650μV K^(−1))and electronic conductivities(0.042 S cm^(−1)),yielding a power factor of 185μW m^(−1) K^(−2),which,collectively,are the highest among all reported n-type organic TE materials.This work may pave the way for the design and development of solution-processed,cross-linked polymer films as promising TE materials.展开更多
The intimate connection between stacking modes and optoelectronic properties of organic conjugated materials has been discussed from the viewpoints of developing microscopic models and further understanding of their f...The intimate connection between stacking modes and optoelectronic properties of organic conjugated materials has been discussed from the viewpoints of developing microscopic models and further understanding of their functions and potential applications.In particular,three basal dimer configurations（cofacial configuration,staggered configuration,and crossed configuration） and their respective optical（including radiative and non-radiative） and electrical properties are expatiated in detail.Eventually,we put forward the perspective on achieving the promising laser material that features high fluorescence quantum yield and charge mobility.展开更多
基金This work was supported by the National Nature Foundation of China (No. 597905006).
文摘The electroluminescence (EL) produced by a highly luminescent phosphorescent dye Cu-4(CdropCPh)(4)L-2 (L = 1.8-bis(di-phenylphosphino)-3,6-dioxaoctane, Cu-4) doped polymer as emitting layer is reported. The effects of the charge injection balance on the polymers, in particular, poly(N-vinylcarbazole) (PVK) have been studied by using photoluminescence and electroluminescence spectroscopy. Changes in the emission spectra demonstrate the influence of the charge injection balance on the formation ratio of triplet and singlet excitons. This provides a new technical approach to realize the color patterning in polymer LEDs.
基金ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China. （No.21103161. No.11274142, No.11304058, No.11274034. and No.11004080） and the China Postdoctoral Science Foundation （No.2011MS00927 and No.2013T60319）.
文摘The optical properties of three linear conjugated oligomers （F-P, F-P-F, and P-F-P-F-P）, where phenothiazine （P） and fluorene （F） groups arrange alternately, are investigated. With the enhancement of the π-conjugated system, their absorption and emission bands both gradually red shift, and their two-photon properties are also improved. Meanwhile, their fluorescence dynamic traces are analyzed with continuous rate distribution model, exhibiting that their decay rates gradually accelerate and the rate distribution width become narrower. The quantum chemical calculation offers their molecular structures and transition mechanism, showing that the enhancement of π-conjugated system should be responsible for tile improvement of two-photon properties.
基金financially supported by the National Natural Science Foundation of China(Nos.U20A6002 and 21733005)the National Key R&D Program of China(No.2020YFA0714604)+1 种基金the Basic and Applied Basic Research Major Program of Guangdong Province(No.2019B030302007)Research and Development Funds for Science and Technology Program of Guangzhou(No.202007020004)。
文摘Electrodeposition is an old and effective method for the fabrication of organic films.Though electrodeposited organic films have been widely used in various applications,highly luminescent films have been a great challenge because the electrochemically doped state may strongly quench the fluorescence.In the first part of this review,the organic electrodeposition techniques,along with general electropolymerization and other special electrodepositions are introduced.In the second part of the review,we describe how to electrochemically fabricate luminescent films for organic light-emitting diodes(OLEDs).With the rational molecular design and well-controlled electrodeposition process,we have not only demonstrated high-performance OLEDs,but also paved a promising way to practice active-matrix OLEDs(AMOLEDs)and super-resolution OLEDs.In particular,RGB 3×3 array OLEDs based on active-matrix substrates,RGB passive-matrix OLEDs(PMOLEDs)with a resolution of 210 ppi,and monochromatic OLEDs with a super-resolution of 2822 ppi have been successfully fabricated.It is highly anticipated that the organic electrodeposition technology is of comparable or perhaps even higher contenders in manufacturing and downscaling OLEDs and AMOLEDs with low-cost and high-resolution for the human-computer interaction fields such as augmented reality(AR),virtual reality(VR),etc.
基金supported by the National Natural Science Foundation of China(nos.21975078 and 91833304)the Fundamental Research Funds for the Central Universities,the Introduced Innovative R&D Team of Guangdong Province(no.201101C0105067115)+1 种基金the Natural Science Foundation of Guangdong Province(no.2019B030301003)the 111 Project,and the Thousand Youth Talents Plan.
文摘As two pivotal functional segments,triazine and porphyrin can be coupled to form a highly cross-linked conjugated polymer.Although the obtained conjugated polymers are almost insoluble in most solvents,a small amount of protonic acid can cause the formation of a colloidal solution of polymers.The dissolution process has proved to be a surface charge effect induced by protonation of porphyrin units in the polymer framework.High-quality conjugated polymer films have been prepared on diverse substrates by solution drop-casting and then used for thermoelectric(TE)applications.The films exhibit remarkable TE performance with high Seebeck coefficients(−6650μV K^(−1))and electronic conductivities(0.042 S cm^(−1)),yielding a power factor of 185μW m^(−1) K^(−2),which,collectively,are the highest among all reported n-type organic TE materials.This work may pave the way for the design and development of solution-processed,cross-linked polymer films as promising TE materials.
基金financial support from the National Natural Science Foundation of China(Nos.51373054,51573055,51473052,51521002,21334002)National Basic Research Programme of China(973 Programme,Nos.2013CB834705,2014CB643504)Fundamental Research Funds for the Central Universities and Introduced Innovative R&D Team of Guangdong(No.201101C0105067115)
文摘The intimate connection between stacking modes and optoelectronic properties of organic conjugated materials has been discussed from the viewpoints of developing microscopic models and further understanding of their functions and potential applications.In particular,three basal dimer configurations（cofacial configuration,staggered configuration,and crossed configuration） and their respective optical（including radiative and non-radiative） and electrical properties are expatiated in detail.Eventually,we put forward the perspective on achieving the promising laser material that features high fluorescence quantum yield and charge mobility.
