Amplified Spontaneous Emission in Conjugated Polyrotaxanes Under Quasi‐cw Pumping

Mróz, Marta M.; Sforazzini, Giuseppe; Zhong, Yi; Wong, Kam Sing; Anderson, Harry L.; Lanzani, Guglielmo; Cabanillas‐González, Juan

doi:10.1002/adma.201301703

Cited by 47 publications

(27 citation statements)

References 32 publications

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“…[ 1,2 ] Among them, nondoped organic lasers are highly attractive because they suffer little from the concentration quenching that plagues typical dye-doped organic lasers. [3][4][5][6][7][8] A crucial point to ensure commercial applications is environmental stability. To date, facing to the challenge of electrically pumped organic laser, many efforts have been devoted in realizing large stimulated emission cross sections (σ e ), low lasing thresholds, boosting power-conversion effi ciencies and high carrier mobility.…”

Section: Doi: 101002/adma201305355mentioning

confidence: 99%

H‐Shaped Oligofluorenes for Highly Air‐Stable and Low‐Threshold Non‐Doped Deep Blue Lasing

et al. 2014

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H-shaped oligofluorenes as gain media exhibit excellent photo- (large robustness against oxidation) and thermal stabilities in ambient atmosphere for large σe and low-threshold (0.22 nJ pulse(-1) ) deep blue distributed feedback (DFB) lasers. Their amplified spontaneous emission (ASE) thresholds increase less than 3-fold and the emission spectra exhibit almost no shift with film samples annealed up to 200 °C in open air.

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Section: Doi: 101002/adma201305355mentioning

confidence: 99%

H‐Shaped Oligofluorenes for Highly Air‐Stable and Low‐Threshold Non‐Doped Deep Blue Lasing

et al. 2014

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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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“…Growing attention is paid today to cyclodextrin-based rotaxanes, 86,87 and especially to cyclodextrin-based polyrotaxanes, [88][89][90][91][92][93][94][95] interesting for their valuable properties. Another class is the calixarene-based rotaxanes.…”

Section: Discussionmentioning

confidence: 99%

Radical-radical rotaxanes with tetracationic cyclophane ring, and quaternary azaaromatic rotaxanes with cage macrocycles

Deska¹,

Nowik-Zając²,

Śliwa³

2014

Arkivoc

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The review consists of two parts. In the first part the radical-radical quaternary azaaromatic rotaxanes containing tetracationic cyclophane ring are described, and in the second part rotaxanes built from quaternary azaaromatic threads and cage macrocycles, such as cyclodextrins, calixarenes, pillararenes and cucurbiturils are presented. The species described here are discussed as regards their properties and possible applications.

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Amplified Spontaneous Emission in Conjugated Polyrotaxanes Under Quasi‐cw Pumping

Cited by 47 publications

References 32 publications

H‐Shaped Oligofluorenes for Highly Air‐Stable and Low‐Threshold Non‐Doped Deep Blue Lasing

H‐Shaped Oligofluorenes for Highly Air‐Stable and Low‐Threshold Non‐Doped Deep Blue Lasing

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

Radical-radical rotaxanes with tetracationic cyclophane ring, and quaternary azaaromatic rotaxanes with cage macrocycles

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