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Efficient Optical Gain from Near‐Infrared Polymer Lasers Based on Poly[N‐9′‐heptadecanyl‐2,7‐carbazole‐alt‐5,5‐(4′,7′‐di‐2‐thienyl‐2′,1′,3′‐benzothiadiazole)]
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-05-31 , DOI: 10.1002/adom.201800263
Yan Xu 1 , Gang Hai 1 , Haowen Xu 1 , Haoran Zhang 1 , Zongyan Zuo 1 , Qi Zhang 1 , Ruidong Xia 1 , Chen Sun 2 , Jose Castro-Smirnov 2 , Ahmad Sousaraei 2 , Santiago Casado 2 , Manuel R. Osorio 2 , Daniel Granados 2 , Isabel Rodriguez 2 , Juan Cabanillas-Gonzalez 2
Affiliation  

State‐of‐the‐art near‐infrared lasers based on poly[N‐9′‐heptadecanyl‐2,7‐carbazole‐alt‐5,5‐(4′,7′‐di‐2‐thienyl‐2′,1′,3′‐benzothiadiazole)] (PCDTBT) and poly(9,9‐dioctylfluorene‐alt‐benzothiadiazole) (F8BT) blends are reported. Polymer light‐emitting diodes (PLEDs) based on PCDTBT/F8BT blends with 30 wt% PCDTBT content exhibit a maximum radiance of 64.3 W sr−1 m−2 and external quantum efficiency of 2.11% with Commission Internationale de L'Eclairage (CIE) coordinates (x = 0.69, y = 0.30). Using an optimal blend ratio of 15 wt% PCDTBT in F8BT, a maximum gain value of 28.2 cm−1 at 710 nm is achieved, a remarkable value given that PCDTBT is a low emissive polymer extensively employed as donor polymer in organic photovoltaics. The lowest amplified spontaneous emission (ASE) and laser thresholds exhibited by the blends are 590 nJ pulse−1 (21 µJ cm−2) and 63.1 nJ pulse−1 (201 µJ cm−2). Transient absorption spectroscopy confirms efficient Förster resonant energy transfer from F8BT to PCDTBT which, together with the large miscibility of PCDTBT in F8BT, enables PCDTBT emission enhancement and optical gain. Furthermore, a ternary blend system composed of F8BT, PCDTBT, and poly(3‐hexylthiophene) is demonstrated, in which the ASE wavelength can be tuned in a 60 nm range from 650 to 710 nm at a very low threshold level via control of the blend content ratio.

中文翻译:

基于聚[N-9'-十七碳烯基-2,7-咔唑-alt-5,5-(4',7'-二-2-噻吩基-2',1')的近红外聚合物激光器的高效光学增益,3'-苯并噻二唑)]

状态的最先进的基于聚[近红外激光器Ñ -9'-heptadecanyl -2,7-咔唑ALT -5,5-(4',7'-二-2-噻吩基-2', 1',3'-苯并噻二唑)](PCDTBT)和聚(9,9-二dioctylfluorene- ALT -benzothiadiazole)的报告(F8BT)的共混物。基于PCDTBT / F8BT共混物且PCDTBT含量为30 wt%的聚合物发光二极管(PLED)在国际照明委员会(CIE)的认可下显示出最大辐射度为64.3 W sr -1 m -2,外部量子效率为2.11%坐标(x = 0.69,y = 0.30)。在F8BT中使用15 wt%PCDTBT的最佳混合比例,最大增益值为28.2 cm -1由于PCDTBT是一种低辐射聚合物,被广泛用作有机光伏中的供体聚合物,因此在710 nm处实现了一个非凡的价值。共混物显示的最低放大自发发射(ASE)和激光阈值为590 nJ脉冲-1(21 µJ cm -2)和63.1 nJ脉冲-1(201 µJ cm -2))。瞬态吸收光谱法证实了从F8BT到PCDTBT的有效Förster共振能量转移,再加上PCDTBT在F8BT中的大混溶性,可以增强PCDTBT的发射和光学增益。此外,还演示了由F8BT,PCDTBT和聚(3-己基噻吩)组成的三元共混体系,其中,通过控制ASE波长,可以在非常低的阈值水平下将ASE波长调节在650至710 nm的60 nm范围内。共混物含量比。
更新日期:2018-05-31
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