Optically Pumped Lasing from Single Crystals of a Cyano‐Substituted Thiophene/Phenylene Co‐Oligomer

Mizuno, Hitoshi; Maeda, Takuro; Yanagi, Hisao; Katsuki, Hirohiko; Aresti, Mauro; Quochi, Francesco; Saba, Michele; Mura, Andrea; Bongiovanni, Giovanni; Sasaki, Fumio; Hotta, Shu

doi:10.1002/adom.201400083

Cited by 43 publications

(49 citation statements)

References 27 publications

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“…Therefore, we should use TPCO crystals having a lying molecular orientation which enables surface emission from the crystal face. Among a variety of TPCO derivatives, we found that cyano‐substituted TPCOs satisfy this condition, and their single crystals show polaritonic characteristics in the VCSELs . In this section, we present angle‐resolved and time‐resolved spectroscopy measurements to demonstrate the polariton formation and discuss them in relation to cooperative behaviors mentioned in the previous sections.…”

Section: Polaritonic Emission From Microcavity Structures With Tpco Cmentioning

confidence: 75%

Cooperative Behaviors in Amplified Emission from Single Microcrystals of Thiophene/Phenylene Co‐Oligomers toward Organic Polariton Laser

Yanagi

Sasaki

Yamashita

2019

Advanced Optical Materials

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After successful commercialization of organic light‐emitting diodes (OLEDs), organic semiconductor lasers have become a practical research target for versatile optoelectronic applications. Realization of electrically pumped lasing with molecular materials faces critical issues such as exciton quenching by injected carriers, nonradiative triplet states, and difficulties in introduction of resonators. One of potential routes to overcome them is to utilize polaritonic emission based on cooperative coupling of photons with excitons and/or phonons in molecular crystals. This report overviews cooperative behaviors observed in amplified emissions from single‐crystal thiophene/phenylene co‐oligomers (TPCOs) and discusses their expected potential toward organic polariton lasers. First, amplified emission accompanied with unusual time delay, spectral splitting, and fluence dependence of lasing threshold is presented, suggesting superfluorescence from macroscopically correlated molecular excitons, not based on the conventional stimulated emission process. Second, selectively enhanced Raman scattering under off‐resonant condition is shown, which is interpreted as a result of contribution of coherent vibrations in the TPCO crystals. Then, angle‐resolved spectroscopies demonstrate a stable existence of exciton polaritons at room temperature in microcavity devices with TPCO crystals. It is concluded that all those unique behaviors are ascribed to the TPCO excitons and vibrations having large oscillator strength under the uniaxially oriented molecular alignment.

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Section: Polaritonic Emission From Microcavity Structures With Tpco Cmentioning

confidence: 75%

Cooperative Behaviors in Amplified Emission from Single Microcrystals of Thiophene/Phenylene Co‐Oligomers toward Organic Polariton Laser

Yanagi

Sasaki

Yamashita

2019

Advanced Optical Materials

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“…After these achievements many organic semiconductors including TPCOs were reported to exhibit laser oscillation in the form of a single crystal . Peculiar crystallographic structures of TPCOs are responsible for it . In TPCO crystals the molecules are aligned either vertically or horizontally to the bottom (wide) crystal plane.…”

Section: Laser Oscillation From a Thin Single Crystalmentioning

confidence: 99%

Optically and electrically excited emissions from organic semiconducting oligomer crystals

Hotta

2016

Polymer International

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This paper reviews optically and electrically excited emissions from organic semiconducting oligomers in the form of their single crystals. Of the semiconducting oligomers, the review focuses on thiophene/phenylene co-oligomers (TPCOs). The topics cover crystal growth and laser oscillation along with related spectrally narrowed emissions of TPCO crystals. Aside from the strong excitation with a laser beam, weak excitation using a mercury lamp produces optical fringes superimposed on broadband emission spectra. The laser oscillation spectra accompanied by longitudinal multimode and optical fringes observed from the weak excitation have the same origin. This enables us to determine optical constants (i.e. refractive indices) and their dispersion of the crystals and provides sufficient information for the construction of optoelectronic devices based on the organic crystals. As a typical example, the review outlines the improved device constitution and performance as well as device operation methods with light-emitting field-effect transistors (LEFETs), because the device configuration is suited for cutting-edge devices including lasers. Finally the review presents device performance of LEFETs having a diffraction grating. These devices are suited for exploring the possibility of constructing a next-generation current-injected laser device.

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“…14 Optically pumped lasing has already been reported for single crystals of 2,5-bis(4 -cyanobiphenyl-4-yl)thiophene (BP1T-CN). 15 In this work, we fabricate heterojunction-type OLEDs using TPCO derivatives having a molecular framework of 5,5 -bis (4-biphenylyl)-2,2 -bithiophene (BP2T) which consists of biphenyl-capped bithiophene. This unsubstituted BP2T was chosen as a p-type while cyano-substituted BP2T, 5,5 -bis (4 -cyanobiphenyl-4-yl)-2,2 -bithiophene (BP2T-CN), was used as n-type.…”

Section: Introductionmentioning

confidence: 99%

Organic Light-Emitting Diodes with Heterojunction of Thiophene/Phenylene Co-Oligomer Derivatives

Dokiya

Ono

Sasaki

et al. 2016

j nanosci nanotechnol

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Organic light-emitting diodes are fabricated by heterojunction of thiophene/phenylene co-oligomer films using biphenyl-capped bithiophene (BP2T) and its cyano-substituted derivative (BP2T-CN). Strong electron-withdrawing cyano-groups in BP2T-CN transform the p-type BP2T into n-type. Photoluminescence and electroluminescence from their bilayered films dominantly result from the BP2T-CN layer since the lying molecular orientation of BP2T-CN facilitates surface emission while the standing orientation of BP2T is not suitable for the device configuration. The current density and electroluminescence intensity are considerably increased by carrier doping with MoO3 and Cs2CO3 into the BP2T and BP2T-CN films, respectively.

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Optically Pumped Lasing from Single Crystals of a Cyano‐Substituted Thiophene/Phenylene Co‐Oligomer

Cited by 43 publications

References 27 publications

Cooperative Behaviors in Amplified Emission from Single Microcrystals of Thiophene/Phenylene Co‐Oligomers toward Organic Polariton Laser

Cooperative Behaviors in Amplified Emission from Single Microcrystals of Thiophene/Phenylene Co‐Oligomers toward Organic Polariton Laser

Optically and electrically excited emissions from organic semiconducting oligomer crystals

Organic Light-Emitting Diodes with Heterojunction of Thiophene/Phenylene Co-Oligomer Derivatives

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