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Lasing Operation under Long‐Pulse Excitation in Solution‐Processed Organic Gain Medium: Toward CW Lasing in Organic Semiconductors
Advanced Optical Materials ( IF 9 ) Pub Date : 2020-09-09 , DOI: 10.1002/adom.202001234
Van T. N. Mai 1, 2 , Atul Shukla 1, 3 , A. M. Chathuranganie Senevirathne 4, 5 , Ilene Allison 1, 2 , Hyunsoo Lim 1, 3 , Romain J. Lepage 2 , Sarah K. M. McGregor 1, 2 , Michael Wood 1, 2 , Toshinori Matsushima 4, 5, 6 , Evan G. Moore 2 , Elizabeth H. Krenske 2 , Atula S. D. Sandanayaka 7 , Chihaya Adachi 4, 5, 6 , Ebinazar B. Namdas 1, 3 , Shih‐Chun Lo 1, 2
Affiliation  

High mechanical flexibility and wavelength tunability of organic semiconductor materials have propelled the development of organic semiconductor lasers (OSLs) as a complementary technology to current inorganic lasers. While excellent progress has been made across multiple aspects of OSLs, demonstration of long‐pulse operation [quasi‐continuous wave (qCW) or continuous wave (CW)] lasing has presented significant challenges due to the detrimental accumulation of triplets under long‐pulse photoexcitation and substantial quenching of singlet excitons, arising from singlet‐triplet annihilation (STA). In particular, qCW or CW lasing from solution‐processed OSL materials has not been reported, and thus remains a long‐thought objective in optoelectronic research. Using a novel bis(N‐carbazolylstyryl)‐9,9‐dihexylfluorene (BSFCz), the first solution‐processable organic laser dye demonstrating lasing oscillation in the long‐pulse photoexcitation regime (up to 10 ms pulse width) with a low threshold (420 W cm−2), which in part can be attributed to its negligible spectral overlap between triplet excited‐state absorption and laser emission, is herein reported. Temporal emission profiles below and above the lasing threshold also demonstrate that STA has a negligible effect on emission. These combined observations show BSFCz incur low losses due to triplet excited‐states, leading to extremely small changes in lasing thresholds when moving from pulsed to qCW (>1 ms) excitation.

中文翻译:

在溶液处理的有机增益介质中进行长脉冲激励下的激光操作:走向有机半导体中的连续波激光

有机半导体材料的高机械柔韧性和波长可调谐性推动了有机半导体激光器(OSL)的发展,作为目前无机激光器的补充技术。尽管在OSL的各个方面都取得了卓越的进步,但是由于在长脉冲光激发下三重态的有害积累,长脉冲操作[准连续波(qCW)或连续波(CW)]激光的演示提出了重大挑战。单重态-三重态an灭(STA)引起的单重态激子的大量淬灭。特别是,尚未报道过由固溶处理的OSL材料制成的qCW或CW激光,因此在光电研究中仍然是一个长远的目标。使用新颖的bis(N-咔唑基苯乙烯基)-9,9-二己基芴(BSFCz),第一种可溶液处理的有机激光染料,在低脉冲阈值(420 W cm -2)的长脉冲光激发条件下(高达10 ms脉冲宽度)展示了激光振荡本文报道了其部分归因于其在三重态激发态吸收和激光发射之间可忽略的光谱重叠。低于或高于激射阈值的时间发射曲线也表明STA对发射的影响可忽略不计。这些综合的观察结果表明,由于三重态激发态,BSFCz引起的损耗很小,当从脉冲激发到qCW(> 1 ms)激发时,导致激光阈值的变化非常小。
更新日期:2020-11-04
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