Continuously tunable solution-processed organic semiconductor DFB lasers pumped by laser diode

Klinkhammer, Sönke; Liu, Xin; Huska, Klaus; Shen, Yuxin; Vanderheiden, Sylvia; Valouch, Sebastian; Vannahme, Christoph; Bräse, Stefan; Mappes, Timo; Lemmer, Uli

doi:10.1364/oe.20.006357

Cited by 83 publications

(63 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A blend of conjugated polymer poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo-{2,1',3}-thia-diazole)] (F8BT, ADS233YE, American Dye Source, Inc.) and poly[2-methoxy-5-(2-ethylhexyl-oxy)-1,4-phenylene-vinylene (MEH-PPV, ADS100RE, American Dye Source, Inc.) was dissolved in toluene at a concentration of 20 mg/ml (85:15 wt%). Two different solution processing routes, spin coating and horizontal dipping [7], have been adopted to deposit an active F8BT:MEH-PPV layer with film thickness of 270 nm and 210 nm, respectively, onto the grating substrate. The AFM images in Figs.…”

Section: Discussionmentioning

confidence: 99%

“…Laser devices with emission within the whole visible spectrum can be realized. Further advantages are efficient energy conversion which allows optical pumping with laser diodes [3][4][5][6][7] or light emitting diodes [8,9] and simplicity of fabrication. Low threshold laser devices with single longitudinal mode emission can be realized using distributed feedback (DFB) structures.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pump spot size dependent lasing threshold in organic semiconductor DFB lasers fabricated via nanograting transfer

Liu¹,

Klinkhammer²,

Wang³

et al. 2013

Opt. Express

Self Cite

View full text Add to dashboard Cite

Optically excited organic semiconductor distributed feedback (DFB) lasers enable efficient lasing in the visible spectrum. Here, we report on the rapid and parallel fabrication of DFB lasers via transferring a nanograting structure from a flexible mold onto an unstructured film of the organic gain material. This geometrically well-defined structure allows for a systematic investigation of the laser threshold behavior. The laser thresholds for these devices show a strong dependence on the pump spot diameter. This experimental finding is in good qualitative agreement with calculations based on coupled-wave theory. With further investigations on various DFB laser geometries prepared by different routes and based on different organic gain materials, we found that these findings are quite general. This is important for the comparison of threshold values of various devices characterized under different excitation areas. Weimann, J. Wang, and P. Hinze, "Laser threshold reduction in an all-spiro guest-host system," Appl. Phys. Lett. 85(10), 1659-1661 (2004). 14. X. Liu, S. Klinkhammer, K. Sudau, N. Mechau, C. Vannahme, J. Kaschke, T. Mappes, M. Wegener, and U.Lemmer, "Ink-jet-printed organic semiconductor distributed feedback laser," Appl. Phys. Express 5(7), 072101

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pump spot size dependent lasing threshold in organic semiconductor DFB lasers fabricated via nanograting transfer

Liu¹,

Klinkhammer²,

Wang³

et al. 2013

Opt. Express

Self Cite

View full text Add to dashboard Cite

show abstract

“…[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

View full text Add to dashboard Cite

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.

show abstract

“…In the past decade, various OSSL architectures have been developed based on thin-film gain media, realized with cost-effective techniques like spin coating, drop casting, or ink jet printing [7]. Lasing has been achieved with many optical resonator architectures, such as Distributed Feedback (DFB) resonators [8,9], Fabry-Perot waveguide lasers [10], microrings [11], vertical microcavities [12], or external cavity resonators [13]. In addition of their unique spectral flexibility in the visible range, OSSLs have specific properties compared to their inorganic counterparts: first, lasing in a continuous-wave (CW) regime has not been demonstrated yet, due to the piling up of triplet excitons which induce quenching of singlet states and additional losses due to triplet-triplet absorption [14]; second, all organic materials are prone to photodegradation under intense optical pumping [15,16].…”

Section: Introductionmentioning

confidence: 99%

Thermal effects in thin-film organic solid-state lasers

Zhao¹,

Mhibik²,

Leang³

et al. 2014

Opt. Express

View full text Add to dashboard Cite

Abstract:With the recent development of organic solid-state lasers (OSSLs) architectures enabling power scaling and progresses towards continuous-wave operation, the question of thermal effects now arises in OSSLs. In this paper, a Rhodamine 640-PMMA based vertical external cavity surface emitting organic laser is investigated. A thermal microscope is used to record temperature maps at the organic thin film surface during laser action; those maps are compared with time-resolved finite element thermal simulations. The measured and simulated peak temperature rises are in good accordance and are shown to remain below 10 K in standard operating conditions, showing a negligible impact on performance. The validated model is used to investigate typical OSSL structures from the literature, in a virtual high average power regime, and up to the CW regime. It is shown that whenever true CW organic lasing will be realized, significant thermal effects will have to be considered and properly managed. Rev. B 56(8), R4363-R4366 (1997). 12. H. Sakata, K. Yamashita, H. Takeuchi, and M. Tomiki, "Diode-pumped distributed-feedback dye laser with an organic-inorganic microcavity," Appl. Phys. B 92(2), 243-246 (2008). 13. H. Rabbani-Haghighi, S. Forget, S. Chénais, and A. Siove, "Highly efficient, diffraction-limited laser emission from a Vertical External-Cavity Surface-emitting Organic Laser," Opt. Lett. 35(12), 1968-1970 (2010

show abstract

Continuously tunable solution-processed organic semiconductor DFB lasers pumped by laser diode

Cited by 83 publications

References 35 publications

Pump spot size dependent lasing threshold in organic semiconductor DFB lasers fabricated via nanograting transfer

Pump spot size dependent lasing threshold in organic semiconductor DFB lasers fabricated via nanograting transfer

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

Thermal effects in thin-film organic solid-state lasers

Contact Info

Product

Resources

About