Deep‐Red Lasing and Amplified Spontaneous Emission from Nature Inspired Bay‐Annulated Indigo Derivatives,Advanced Optical Materials

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Deep‐Red Lasing and Amplified Spontaneous Emission from Nature Inspired Bay‐Annulated Indigo Derivatives
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2019-11-14 , DOI: 10.1002/adom.201901350
Atul Shukla _{1,

2} , Nicholle R. Wallwork _{1,

3} , Xin Li _{1,

3} , Jan Sobus _{1,

2} , Van T. N. Mai _{1,

3} , Sarah K. M. McGregor _{1,

3} , Kay Chen ₃ , Romain J. Lepage ₃ , Elizabeth H. Krenske ₃ , Evan G. Moore ₃ , Ebinazar B. Namdas _{1,

2} , Shih‐Chun Lo _{1,

3}

Affiliation

While noteworthy progress has been made on organic solid‐state lasers with low amplified spontaneous emission (ASE) thresholds and high optical gains in blue and green colors, the same advancement has not been achieved for red laser dyes. This is mainly due to their low photoluminescence quantum yields (PLQYs) because of “energy bandgap law.” Here, a new family of solution‐processable organic semiconductor laser dyes based on a bay‐annulated indigo derivative (Cibalackrot) with deep‐red emission is reported. They exhibit excellent PLQYs and low ASE thresholds (9.6 µJ cm⁻²) with deep‐red emission when blended in a mixed host of 1,3‐bis(N‐carbazolyl)benzene (mCP) and 2‐hydroxyphenylbenzothiazole (HBT). In contrast to a single blend in mCP, the co‐blend films are found to significantly enhance the photostability by retaining 90% of initial ASE intensity even after continuous pumping with over 9000 pulses at a pump input energy twice that of the ASE threshold, which can be attributed to efficient cascade energy transfer from mCP to HBT and then to the Cibalackrot chromophore. Low lasing threshold of 6 µJ cm⁻² is further achieved at 641 nm by using distributed feedback gratings. Transient absorption spectroscopy measurements indicate that the dye has extremely low yield of triplet excited‐state under optical excitation. The results show Cibalackrot derivatives to be a promising new family of organic deep‐red laser dyes.

中文翻译：

自然启发的月桂色靛蓝衍生物的深红色发射和放大的自发发射

尽管在具有低放大自发发射（ASE）阈值和蓝色和绿色的高光学增益的有机固态激光器方面取得了显着进展，但红色激光染料却没有取得同样的进步。这主要是由于“能带隙定律”导致它们的光致发光量子产率（PLQYs）低。在此，报道了一种新的可溶液处理的有机半导体激光染料家族，其基于具有深红色发射光的月桂色靛蓝衍生物（Cibalackrot）。当掺入1,3-bis（N）的混合基质中时，它们表现出出色的PLQY和低ASE阈值（9.6 µJ cm ^-2），并具有深红色发射。-咔唑基）苯（mCP）和2-羟基苯基苯并噻唑（HBT）。与mCP中的单一共混物相比，即使在泵浦输入能量为ASE阈值两倍的9000个脉冲下连续泵浦后，共混膜仍可保持90％的初始ASE强度来显着提高光稳定性。可以归因于从mCP到HBT的有效级联能量转移，然后到Cibalackrot发色团。通过使用分布式反馈光栅，可以在641 nm处实现6 µJ cm ^-2的低激光阈值。瞬态吸收光谱测量表明，该染料在光激发下三重激发态的收率极低。结果表明Cibalackrot衍生物是有机深红激光染料的一个有前途的新家族。

更新日期：2020-01-17

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