Photo-physical properties and amplified spontaneous emission of a new derivative of fluorescein

Al-shamiri, Hamdan A. S.; Kana, Maram T.H. Abou; Azzouz, I.M.; Elwahy, Ahmed H. M.

doi:10.1016/j.optcom.2009.12.028

Cited by 12 publications

(5 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[32] After the CuAAC reaction and treatment with K 2 CO 3 , P1-FluK and P2-FluK had no absorption at 2100 cm -1 , suggesting the complete conversion of the azido groups in P1-N3 and P2-N3 after the CuAAC "click" reaction. Most absorption bands between 1730 and 846 cm -1 were ascribed to the fluorescein moieties in P1-FluoK and P2-FluoK [34]. NMR spectra of (A) P2-FluK and (B) P2-FluKCE, respectively.…”

mentioning

confidence: 99%

Synergistic dielectric and semiconducting properties in fluorescein monopotassium salt random copolymers

Zhao

Zhang

Pejić

et al. 2017

Polymer

View full text Add to dashboard Cite

The low dielectric constant (ε r ~ 3-4) for semiconducting polymers has been a major cause for their poor performance compared with the inorganic semiconductors, which possess high dielectric constants above 10. This study aimed to increase the electronic/atomic dielectric constant at high frequencies (i.e., ε r∞ ) for semiconducting polymers.A new design strategy was proposed based on the electric field-induced tautomeric structures in conjugated fluorescein. To achieve this goal, fluorescein monopotassium salt-containing random copolymers were synthesized with 50 and 75 mol.% functionality. To reduce the strong electrostatic attraction between the K + cation and the phenolate anion, 18-crown-6 ether was complexed with K + in the fluorescein copolymers. A relatively high ε r∞ of ~5.5 and high electron mobility of 0.153 cm 2 /(V·s) were achieved for the 75 mol.% fluorescein K + /18C6 copolymer. The high electron mobility could be attributed to the relatively high static dielectric constant (ε rs ~ 9 at 1 Hz) of the sample. The fluorescein monopotassium salt copolymers behaved as n-type semiconductors with an optical band gap around 2.26 eV. charge carrier mobility, optical band gap 1. Introduction Polymeric semiconductors have drawn much attention in research because of their promise to enable inexpensive, flexible, lightweight, and scalable organic electronic devices, such as organic photovoltaics (OPVs), photodetectors, field-effect transistors, and organic light-emitting diodes.[1, 2] However, typical dielectric constants (ε r ) for semiconducting polymers are fairly low (ε r ~ 3-4), in contrast with crystalline silicon, ε r = 11.7 [3] and semiconducting perovskites, ε r = 28.[4] The low ε r has a negative impact for OPV and photodetector applications. For example, excitons in semiconducting polymers have a large binding energy of 0.3-1.0 eV, which is currently overcome by using a heterojunction between two organic semiconductors (a donor and an acceptor) having an appropriate energy offset.[5]This reduces the available electrochemical potential energy, thus limiting open circuit voltages (V oc ) and the power conversion efficiency (PCE). Furthermore, the strong Coulombic attractions promote charge recombination, limiting free charge carrier generation, transport and collection. These further lower the PCE and the optimal film thickness in OPVs.The permittivity of a dielectric material relates to how easily charges can be separated (or polarized) in the bulk.[6] The higher the ε r , the easier the charges can be polarized. The separated charges can greatly increase the local electric field due to the applied field-induced long-range dipole-dipole interactions.[7] As a result, a high ε r favors easy charge carrier formation (i.e., exciton dissociation) and charge carrier mobility in semiconducting polymers.According to theoretical calculations, high exciton dissociation energy and charge carrier

show abstract

mentioning

confidence: 99%

Synergistic dielectric and semiconducting properties in fluorescein monopotassium salt random copolymers

Zhao

Zhang

Pejić

et al. 2017

Polymer

View full text Add to dashboard Cite

show abstract

“…The photo-physical and optical properties of fluorescein in solution display a strong dependence of the molecular structure of the dyes, since substitution of the probe may, in some instance, modify both electronic absorption and maximum emission due to the change in the electronic environment of the molecular structure of the probe. 121,122 Typical "off-on" type fluorescein-based probes can be easily designed using the spirolactone-ring opening mechanism. 123 A very efficient route for the synthesis of fluorescein-based Nglycosamine derivatives has been designed 124 through conjugation of 1,6-benzylidene-protected glucopyranose with a fluorescein bis-aniline ( Figure 39).…”

Section: Fluorescein-based Glycoconjugatesmentioning

confidence: 99%

Fluorescent glycoconjugates and their applications

Thomas

Yan

et al. 2020

Chem. Soc. Rev.

View full text Add to dashboard Cite

show abstract

“…After careful de-aeration by purging with inert gas, the test tube was sealed. Copolymerization reaction was performed in a temperature-controlled oven; the temperature is maintained at 60 °C for 7 days and then it was reduced in steps of 10 °C per day until room temperature was reached [27].…”

Section: Polymeric Disc Samples Preparationmentioning

confidence: 99%

Effect of polymeric dye network bonding on fluorescence thermometry for optical fiber temperature sensor

Mahmoud

Negm

Kana

et al. 2023

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Fluorescein and two of its derivatives (allyl Fluorescein and diallyl Fluorescein) are solidified in glycidyl methacrylate (GMA) polymer matrix for the development of fluorescence-based fiber optically temperature sensor. These two Fluorescein derivatives were investigated in order to study the influence of degree of covalent bonds to GMA polymer backbone on Fluorescein dye sensitivity for temperature changes. The dye-polymer discs have been investigated separately in order to determine their sensitivities in the temperature ranges from 10 to 300 K and from 297 to 370 K. The dye-polymer discs are excited by Argon ion laser (488 nm, 50 mW) and the fluorescence intensity is measured using lock-in technique. Below room-temperature Fluorescein dye in (GMA) polymer shows very weak sensitivity toward temperature changes in the range from 10 up to 297 K. The fluorescence intensity peaks of allyl Fluorescein dye in (GMA) polymer exhibit tendency for decreasing slightly, while the dye is warmed up from 40 to 245 K. Also, the fluorescence intensity peaks of diallyl Fluorescein dye in (GMA) are reported in the temperature range from 49 to 300 K. The intensity peak values decrease gradually, whereas at the temperature 171 and 229 K the peaks show hazard change. Above room temperature, the fluorescence intensity peaks decrease with increasing temperature in the temperature range from 302 to 370 K.

show abstract

Photo-physical properties and amplified spontaneous emission of a new derivative of fluorescein

Cited by 12 publications

References 34 publications

Synergistic dielectric and semiconducting properties in fluorescein monopotassium salt random copolymers

Synergistic dielectric and semiconducting properties in fluorescein monopotassium salt random copolymers

Fluorescent glycoconjugates and their applications

Effect of polymeric dye network bonding on fluorescence thermometry for optical fiber temperature sensor

Contact Info

Product

Resources

About