Amplified spontaneous emission in optically pumped neat films of a polyfluorene derivative

Li, Jiu Yan; Laquai, Frédéric; Wegner, Gerhard

doi:10.1016/j.cplett.2009.07.028

Cited by 22 publications

(11 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is 4 to 5 times less compared to other investigated compound absorption at 532 nm. Obtained threshold values are still relatively large in comparison with threshold values of several tens kilowatts per square centimetre reported for some other materials [13,14]. However, direct comparison is difficult because ASE threshold, in addition to material properties, like, absorption, depends also on the sample and excitation geometries, film thickness and excitation pulse durations.…”

Section: Amplified Spontaneous Emission Propertiesmentioning

confidence: 74%

Light-emitting thin films of glassy forming organic compounds containing 2-tert-butyl-6-methyl-4H-pyran-4-ylidene

Vembris

Pudžs

Muzikante

2012

Organic Photonics V

View full text Add to dashboard Cite

Low molecular mass organic compounds which make thin films from volatile organic solutions would be great benefit in future organic light emitting systems. Two most important advantages could be mentioned. First -the repetition of synthesis of small molecules is better than for polymers. Second -wet casting methods could be used. In this work we are presenting optical, electroluminescence and amplified spontaneous emission properties of four original glassy forming compounds containing 2-tert-butyl-6-methyl-4H-pyran-4-ylidene fragment as backbone of the molecule. They has the same N,N-dialkylamino electron donating group with incorporated bulky trityloxy ethyl groups. The difference of these compounds is in electron acceptor group. One has 1H-indene-1,3(2H)-dione group, second has pyrimidine-2,4,6(1H,3H,5H)-trione group, third has malononitrile group and fourth has 2-ethyl-2-cyanoacetate. Absorption maximum of the compounds is between 420 and 500 nm and is red shifted from weaker acceptor group to stronger one. The electroluminescence efficiency for simple device ITO/PEDOT:PSS/Organic compound/BaF/Al is low. For the best one with malononitrile group it was 0.13 cd/A and 0.036 lm/W. It could be increased by optimising the sample geometry or adding addition layers for charge carrier transport and exciton blocking. But nevertheless the use of these compounds in organic light emitting devices in neat films is unlikely. Attached bulky trityloxy ethyl groups and tert-butyl group decrease interaction between the molecules thus allowing to obtain amplified spontaneous emission in neat thin films for all investigated compounds.

show abstract

Section: Amplified Spontaneous Emission Propertiesmentioning

confidence: 74%

Light-emitting thin films of glassy forming organic compounds containing 2-tert-butyl-6-methyl-4H-pyran-4-ylidene

Vembris

Pudžs

Muzikante

2012

Organic Photonics V

View full text Add to dashboard Cite

show abstract

“…In order to determine the ASE threshold from the relation between the FWHM of the spectra and pump energy (P), the data are plotted and fitted according to Eq. (4) [13,22] FWHM P ð Þ ¼…”

Section: Measurement Of Ase Threshold and Optical Gainmentioning

confidence: 99%

“…However, the change of the emitted intensity is small and linear and the change of FWHM of the spectrum is small below a certain value of the pump energy (ASE threshold). The value of ASE threshold can be determined either from the relation between the ASE intensity and pump energy [17] or from the relation between the FWHM and pump energy [13,22]. In order to determine the ASE threshold from the relation between the FWHM of the spectra and pump energy (P), the data are plotted and fitted according to Eq.…”

Section: Measurement Of Ase Threshold and Optical Gainmentioning

confidence: 99%

Optical amplification and photodegradation in films of spiro-quaterphenyl and its derivatives

Abdelawwad

Luan

Messow

et al. 2015

Journal of Luminescence

View full text Add to dashboard Cite

“…To characterize the energy gap in organic solids several methods are applied. In organic crystals as well as amorphous solids charge carriers do not emerge as "bare" quasi-free electrons and holes but as a polaron type quasiparticle, dressed "in electronic and vibronic polarization clouds" [48,49]. Electronically relaxed charges may be formed far enough from each other which give rise to a wider optical band gap EG Opt [49,50].…”

Section: Photoelectrical Properties and Energy Structure Of Glassy Thmentioning

confidence: 99%

Synthesis and Physical Properties of Red Luminescent Glass Forming Pyranylidene and Isophorene Fragment Containing Derivatives

Zariņš¹,

Vembris²,

Kokars³

et al. 2012

Organic Light Emitting Devices

View full text Add to dashboard Cite

Amplified spontaneous emission in optically pumped neat films of a polyfluorene derivative

Cited by 22 publications

References 25 publications

Light-emitting thin films of glassy forming organic compounds containing 2-tert-butyl-6-methyl-4H-pyran-4-ylidene

Light-emitting thin films of glassy forming organic compounds containing 2-tert-butyl-6-methyl-4H-pyran-4-ylidene

Optical amplification and photodegradation in films of spiro-quaterphenyl and its derivatives

Synthesis and Physical Properties of Red Luminescent Glass Forming Pyranylidene and Isophorene Fragment Containing Derivatives

Contact Info

Product

Resources

About