Purity of rubrene single crystals

Kloc, Christian; Tan, Ke-Jie; Toh, Matthias Paul Han Sim; Zhang, K. K.; Xu, Yanping

doi:10.1007/s00339-008-5014-0

Cited by 33 publications

(31 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The three decays are very similar to each other. In particular, the band at 645 nm, which has been argued to grow with oxidation, 6,13,14 decays in the same way as the other bands over multiple time decades. This behavior remained the same among various samples where the prominence of the 645 nm band was different.…”

mentioning

confidence: 95%

“…6,13 The amplitudes of smaller bands around 645 nm and beyond are more sample dependent and have been partially assigned to oxidation. 6,13,14 We first studied the PL dynamics using 1 ps long pulses obtained from a Light Conversion TOPAS (traveling-wave optical parametric amplifier system) pumped at 1 kHz by a Clark-MXR Ti:sapphire amplifier. We used pulses at a wavelength of 420 nm (absorption length of ∼3 μm) and with an energy of the order of 1 μJ focused to a spot-size of 40 μm on the ab surface of the crystals, paying attention to avoiding any surface imperfections.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Triplet exciton dynamics in rubrene single crystals

2011

View full text Add to dashboard Cite

The decay of the photoluminescence excited in rubrene single crystals by picosecond pulses is measured over 7 orders of magnitude and more than 4 time decades. We identify the typical decay dynamics due to triplet-triplet interaction. We show that singlet exciton fission and triplet fusion quantum yields in rubrene are both very large, and we directly determine a triplet exciton lifetime of 100 ± 20 μs, which explains the delayed buildup of a large photocurrent that has been reported earlier for low excitation densities.

show abstract

mentioning

confidence: 95%

mentioning

confidence: 99%

Triplet exciton dynamics in rubrene single crystals

2011

View full text Add to dashboard Cite

show abstract

“…This re-aromatization , 7). [48,49] Bottom: View along the b axis of the unit cell of 7. The re-aromatization at the former quinone position is reflected by the reduction of the bond length from 4 to 7: 143.8(4) to 139.08 (50) can be achieved by reductive elimination of the peripheral phenyl rings of 7 by using an excess of sodium or potassium.…”

Section: Synthesis Of 56:1112-di-o-phenylenetetracene (Dopt 8) Andmentioning

confidence: 99%

High‐Yielding Synthesis and Full Spectroscopic Characterization of 5,6:11,12‐Di‐o‐phenylenetetracene and Its Synthesis Intermediates

2015

View full text Add to dashboard Cite

Herein we present a synthetic gram-scale route to 5,6:11,8), which is a member of the class of cyclopenta-fused polycyclic aromatic hydrocarbons (CP-PAHs). Full analytical characterization of the title compound was carried out by IR, Raman, UV/Vis, and high-field 1 H NMR spectroscopy, as well as by mass spectrometry. A unique double-elimination of phenylide moieties, as the key reaction step, gave DOPT for the first time in high purity and

show abstract

“…This may be a cause for the new strong narrow absorption band at 723 cm −1 , which could be attributed to a twisted Rub conformer CH wagging mode. In the vibrational spectra of peroxides, the characteristic frequency is due to the (O-O) stretching mode, which gives rise to strongly polarized Raman bands about 900-700 cm −1 [23] being, however, weak in the IR absorption. According to [24], the (O-O) stretching vibration interacts with other skeletal C-O and C-C bonds bending vibrations, and there is an extensive coupling between the (O-O), (C-O), and (C-O-O) modes.…”

Section: −C Stretching Vibrations and The Bands At 1589 And 1574 CMmentioning

confidence: 99%

Optical Properties and Stability of Bilayer Rubrene-Alq3 Films Fabricated by Vacuum Deposition

et al. 2018

View full text Add to dashboard Cite

We report on the optical and structural characterization of the two-component vacuum deposited (VD) rubrene (Rub)-Alq3 films. As is known, Rub-doped OLED active materials demonstrate both promising electroluminescence and transistor characteristics. However, in terms of operational lifetime, the Rub practical application in basic devices has a few drawbacks related to its chemical instability. Our main attention was focused on the role of the Alq3 coverage and the isomeric transformation of a Rub molecule on its chemical stability in these structures. By monitoring the evolution of PL emission in time, we found that the Rub degradation in Rub-Alq3 films is slower than that in vacuum-deposited Rub layers. These results demonstrate that the deposition of an Alq3 layer can be a way to enhance the stability of Rub to the photo-oxidation in optoelectronic devices. The Rub amorphous film crystallization at elevated temperatures in open air was observed for the first time.K e y w o r d s: rubrene, Alq3, oxidized rubrene, vacuum deposition, thin films, FTIR spectra, photoluminescence.

show abstract

Purity of rubrene single crystals

Cited by 33 publications

References 13 publications

Triplet exciton dynamics in rubrene single crystals

Triplet exciton dynamics in rubrene single crystals

High‐Yielding Synthesis and Full Spectroscopic Characterization of 5,6:11,12‐Di‐o‐phenylenetetracene and Its Synthesis Intermediates

Optical Properties and Stability of Bilayer Rubrene-Alq3 Films Fabricated by Vacuum Deposition

Contact Info

Product

Resources

About