Solid state solvation effect and reduced amplified spontaneous emission threshold value of glass forming DCM derivative in PMMA films

Vembris, Aivars; Zariņš, Elmārs; Kokars, Valdis

doi:10.1016/j.jlumin.2014.10.050

Cited by 15 publications

(8 citation statements)

References 31 publications

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“…No ASE was observed in 1 wt % ME-1Tr and 1 wt %, 5 wt %, 10 wt % EE-1Tr dye-doped PVK films. Increasing dye ME-1Tr and EE-1Tr concentrations (wt%) in PVK caused a redshift of the PL maxima wavelength of the respective host–guest systems (see Supporting Information, pages S85–S87), like for 4 H -pyran-4ylidene-fragment-containing reactants. , However, increasing dye ME-1Tr and EE-1Tr concentrations (wt%) in PVK caused the blue shift of ASE maxima wavelengths (see Supporting Information, pages S85–S87), which was the exact opposite in comparison to reactant host–guest systems. , Obtained results in PVK matrixes could be explained by a possible aggregation-induced emission enhancement (AIEE) phenomenon for HAPPY dyes in neat films.…”

Section: Results and Discussionmentioning

confidence: 99%

HAPPY Dyes as Light Amplification Media in Thin Films

et al. 2021

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A series of 1H amorphous tri-phenyl pyridine (HAPPY) dyes have been synthesized from luminescent triphenyl-groupcontaining 2-methyl-6-styryl-substituted-4H-pyran-4-ylidene derivatives in reactions with benzylamine and investigated for suitability as solution-processable light-emitting medium components in thin films for amplified spontaneous emission (ASE). Conversion of a 4H-pyrane ring into a 1H-pyridine fragment enables aggregation-induced emission enhancement (AIEE) behavior in the target products and slightly increases thermal stability, glass transition temperatures, and ASE efficiency with PLQY up to 15% and ASE thresholds as low as 46 μJ/ cm 2 in neat spin-cast films, although thermal and photophysical properties are mostly dominated by the incorporated electron acceptors. Continued lasing parameter efficiency parameter improvement experiments revealed that no further optimization of HAPPY dyes by doping in polymer matrixes is required as the amplified spontaneous emission thresholds were lowest in pure neat films due to the AIEE phenomenon.

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Section: Results and Discussionmentioning

confidence: 99%

HAPPY Dyes as Light Amplification Media in Thin Films

et al. 2021

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“…Photoluminescence (PL) spectra of KTB:PVK has small red shifts with the increases of KTB dye concentration in PVK matrix (see Fig.6). Such shifting of photoluminescence spectra is called solid state solvation effect 7,8 it already has been observed in different host-guest systems 7,8,9,10 . It is a usual phenomenon in solutions but relatively rarely has been observed in solid states systems.…”

Section: Optical Propertiesmentioning

confidence: 90%

“…Despite of wide range of investigated weight ratios of dye molecules:polymer system, experimentally was proved that for each dye molecule exist narrow weight ratio of prepared dye molecules:polymer host-guest system at which compounds ASE excitation threshold energy is the lowest. For example: for well-known laser dye DCM the lowest excitation threshold energy could be obtained within the concentration range between 2 and 4 wt% 7,8 , but for its promising symmetric and non-symmetric derivatives DWK-1 8 , DWK-2 8 and DWK-1TB 8 it could be obtained within the concentration range between 15 and 20 wt% 8 .…”

Section: Introductionmentioning

confidence: 99%

Investigation of photoluminescence and amplified spontaneous emission properties of cyanoacetic acid derivative (KTB) in PVK amorphous thin films

Perveņecka

Vembris

Zariņš

et al. 2018

Organic Electronics and Photonics: Fundamentals and Devices

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In this work photoluminescence and amplified spontaneous emission properties of new original 2-cyanoacetic acid derivative mixed in polyvinyl carbazole (PVK) matrix at different concentration were investigated. Ethyl 2-(2-(4-(bis(2-(trityloxy)ethyl)amino)styryl)-6-tert-butyl-4H-pyran-4-ylidene)-2-cyanoacetate (KTB) is recently synthesised nonsymmetric red light emitting laser dye, that in previous experiments with neat thin films showed low amplified spontaneous emission (ASE) threshold value. Based on PVK high refractive index it has been used as a polymer to ensure good planar waveguide structure. According to the previous experiments luminescence quenching is expected in neat amorphous thin films which reduces photoluminescence quantum yield and increases ASE excitation threshold energy. It could be overcome by doping the laser active molecules in polymer matrix. The lowest threshold value of ASE was achieved at 20wt% of KTB molecules in PVK matrix. Ability to significantly decrease intermolecular interactions and excitation threshold energy of investigated compound in the host-guest systems makes KTB promising to be used as a laser dye in preparation of organic solid state lasers.

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“…Despite great progress in this aspect, the development of new polymers involves complicated processes and tedious work. In order to address these issues, blending various polymers or small organic dyes to realize new composite systems in solid-state lasers serves as a strategic route inheriting and improving the performance of an individual molecule, which is advantageous for constructing a four-level energy system for organic lasers. − Particularly, the blend system has great advantages of modulating the emission wavelength, enhancing lasing properties, and decreasing the lasing threshold. During the process, Förster resonant energy transfer (FRET) occurs in which the pump energies are mostly absorbed by the donor, and the excitation is subsequently transferred by FRET to an acceptor with high optical gain, emitting at longer wavelength. , Consequently, the blends combine a high absorption, an effective pumping of materials and low losses, facilitating a four-level energy system beneficial for organic lasers.…”

Section: Introductionmentioning

confidence: 99%

Low Threshold Amplified Spontaneous Emission from Efficient Energy Transfer in Blends of Conjugated Polymers

Liu

Wang

et al. 2020

J. Phys. Chem. C

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The concentration dependence of amplified spontaneous emission (ASE) and lasing characteristics in the blend of blue emitting poly(9,9-dioctylfluorene) (PFO) and ladder-type poly(indenofluorene) (2LF-BT) has been reported. A methodology for selecting the optimal blend composition in the blend systems is developed to enhance the optical gain characteristics. It is observed that as the PFO concentration increases, the ASE threshold rapidly decreases from the original 65 to 4.8 μJ cm −2 (30% PFO). Subsequently, the ASE threshold value gradually increases by further increasing the PFO concentration. Under this circumstance, 30% PFO is the optimized concentration for PFO/2LF-BT binary blend films with the maximum gain of 93 cm −1 and superior ASE stability upon annealing. According to atomic force microscopy (AFM) images, morphologies of blend samples are smooth with no phase separation regardless of the PFO concentration, demonstrating attractive advantages over other previously reported blend systems which usually suffer from phase separation. Distributed feedback (DFB) lasers based on the blend film with 30% PFO have low thresholds of 4.85 μJ cm −2 (0.97 kW cm −2 ) . These optical and gain characteristics render the conjugated polymer blends attractive materials for organic lasing. It is worthwhile to mention that the strategy for judicious selection of the blend systems which comprise conjugated polymers with similar backbone structures has made a great contribution to the improvement of organic lasing performance in terms of ASE properties and optical gains.

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Solid state solvation effect and reduced amplified spontaneous emission threshold value of glass forming DCM derivative in PMMA films

Cited by 15 publications

References 31 publications

HAPPY Dyes as Light Amplification Media in Thin Films

HAPPY Dyes as Light Amplification Media in Thin Films

Investigation of photoluminescence and amplified spontaneous emission properties of cyanoacetic acid derivative (KTB) in PVK amorphous thin films

Low Threshold Amplified Spontaneous Emission from Efficient Energy Transfer in Blends of Conjugated Polymers

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