Conjugated polymers: lasing and stimulated emission

Scherf, Ullrich; Riechel, S.; Lemmer, Uli; Mahrt, Rainer F.

doi:10.1016/s1359-0286(01)00010-9

Cited by 209 publications

(97 citation statements)

References 97 publications

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“…Values are comparable to organic [ 17 ] and other effi cient Qdot gain materials [ 13 , 15 , 18 , 19 ] (typically achieving 0.01-1 mJ · cm − 2 ), demonstrating their potential for highly effi cient, low-cost light-emitting devices with an enhanced photo-stability compared to organic materials, yet no need for high-vacuum fabrication techniques as used in the case of MBE-grown Qdot devices.…”

Section: Doi: 101002/adma201202067mentioning

confidence: 62%

Nearly Temperature‐Independent Threshold for Amplified Spontaneous Emission in Colloidal CdSe/CdS Quantum Dot‐in‐Rods

Moreels¹,

Rainò²,

Gomes³

et al. 2012

Advanced Materials

107

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By careful engineering of the core and shell dimensions in CdSe/CdS colloidal hetero‐nanocrystals, amplified spontaneous emission can be triggered from either the core, shell, or both states simultaneously. The ASE threshold is almost constant over a temperature interval of 5–325 K. This feature is unique to quantum dots and highlights their potential as a gain material, suitable for lasing at elevated temperatures.

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Section: Doi: 101002/adma201202067mentioning

confidence: 62%

Nearly Temperature‐Independent Threshold for Amplified Spontaneous Emission in Colloidal CdSe/CdS Quantum Dot‐in‐Rods

Moreels¹,

Rainò²,

Gomes³

et al. 2012

Advanced Materials

107

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“…[1][2][3][4][5][6] These and other organic gain media can be pumped by compact laser (LD) [7][8][9][10] and lightemit ting (LED) [11,12] diode sources but direct electrical pumping has not been reported yet. Binary blends of conjugated host and guest materials have been used both to enhance LED performance and to reduce optically pumped laser thresholds via efficient exciton generation on the host and/or the guest and rapid hosttoguest Förster resonantenergytransfer (FRET).…”

Section: Introductionmentioning

confidence: 99%

Host Exciton Confinement for Enhanced Förster‐Transfer‐Blend Gain Media Yielding Highly Efficient Yellow‐Green Lasers

Zhang

Liu

Wei

et al. 2018

Adv Funct Materials

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This paper reports state-of-the-art fluorene-based yellow-green conjugated polymer blend gain media using Förster resonant-energy-transfer from novel blue-emitting hosts to yield low threshold (≤7 kW cm −2 ) lasers operating between 540 and 590 nm. For poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) (15 wt%) blended with the newly synthesized 3,6-bis(2,7-di([1,1′-biphenyl]-4-yl)-9-phenyl-9H-fluoren-9-yl)-9-octyl-9H-carbazole (DBPhFCz) a highly desirable more than four times increase (relative to F8BT) in net optical gain to 90 cm −1 and 34 times reduction in amplified spontaneous emission threshold to 3 µJ cm −2 is achieved. Detailed transient absorption studies confirm effective exciton confinement with consequent diffusionlimited polaron-pair generation for DBPhFCz. This delays formation of host photoinduced absorption long enough to enable build-up of the spectrally overlapped, guest optical gain, and resolves a longstanding issue for conjugated polymer photonics. The comprehensive study further establishes that limiting host conjugation length is a key factor therein, with 9,9-dialkylfluorene trimers also suitable hosts for F8BT but not pentamers, heptamers, or polymers. It is additionally demonstrated that the host highest occupied and lowest unoccupied molecular orbitals can be tuned independently from the guest gain properties. This provides the tantalizing prospect of enhanced electron and hole injection and transport without endangering efficient optical gain; a scenario of great interest for electrically pumped amplifiers and lasers.

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“…C onjugated polymers constitute a promising and powerful platform for creating high-fidelity organic photonic and optoelectronic devices, such as lasers [1][2][3][4] , photonic bandgap materials 5 and solar cells 6 . Manufacturing such devices requires the imposition of precise nanoscopic structures within the conjugated polymer material.…”

mentioning

confidence: 99%

Monodisperse conjugated polymer particles by Suzuki–Miyaura dispersion polymerization

2012

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The self-assembly of colloidal building blocks into complex and hierarchical structures offers a versatile and powerful toolbox for the creation of new photonic and optoelectronic materials. However, well-defined and monodisperse colloids of semiconducting polymers, which would form excellent building blocks for such self-assembled materials, are not readily available. Here we report the first demonstration of a suzuki-miyaura dispersion polymerization; this method produces highly monodisperse submicrometer particles of a variety of semiconducting polymers. moreover, we show that these monodisperse particles readily self-assemble into photonic crystals that exhibit a pronounced photonic stopgap.

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Conjugated polymers: lasing and stimulated emission

Cited by 209 publications

References 97 publications

Nearly Temperature‐Independent Threshold for Amplified Spontaneous Emission in Colloidal CdSe/CdS Quantum Dot‐in‐Rods

Nearly Temperature‐Independent Threshold for Amplified Spontaneous Emission in Colloidal CdSe/CdS Quantum Dot‐in‐Rods

Host Exciton Confinement for Enhanced Förster‐Transfer‐Blend Gain Media Yielding Highly Efficient Yellow‐Green Lasers

Monodisperse conjugated polymer particles by Suzuki–Miyaura dispersion polymerization

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