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Simultaneously Enhancing Photoluminescence Quantum Efficiency and Optical Gain of Polyfluorene via Backbone Intercalation of 2,5‐Dimethyl‐1,4‐Phenylene
Advanced Optical Materials ( IF 9 ) Pub Date : 2020-04-30 , DOI: 10.1002/adom.202000187
Qi Zhang 1, 2 , Yinan Wu 1 , Shaoshan Lian 3 , Jinxin Gao 1 , Sihao Zhang 1 , Gang Hai 1 , Chen Sun 2 , Xiangchun Li 1 , Ruidong Xia 1, 4 , Juan Cabanillas‐Gonzalez 3 , Yueqi Mo 3
Affiliation  

Simultaneous enhancement of photoluminescence quantum efficiency (PLQE) and optical gain in semiconducting polymer films is desirable for optically‐ or electrically‐pumped organic solid‐state lasers. In this work, a simple self‐dilution effect is achieved by introducing a small amount (≈10% by weight) of 2,5‐dimethyl‐1,4‐phenylene (DP) units in the backbone of poly(9,9‐dioctylfluorene) (PFO). The resulting copolymers, compared with PFO (PLQE 39%), exhibit a significantly increased PLQE (66%) while keeping similar absorption and photoluminescence profile, concomitant with an enhancement in optical gain properties. The radiative decay rate increases sharply along with a sustaining reduction in the non‐radiative decay rate in these copolymers, following similar principle of physical dilution of a luminescent compound in solution or in a polymer matrix. Among all the copolymers, the one containing 10% DP units exhibits the lowest amplified spontaneous emission/distributed feedback laser threshold (10.9 nJ/1.4 nJ, eightfold reduction), and the highest gain coefficient (54.4 cm−1). The results demonstrate that a moderate DP/fluorene ratio can maximize the beneficial self‐dilution effects. These investigations shed light on new design strategies to achieve conjugated polymers with concurrent high PLQE and large optical gain properties.

中文翻译:

通过2,5-二甲基-1,4-苯撑的骨架嵌入同时提高聚芴的光致发光量子效率和光学增益

同时提高半导体聚合物薄膜中的光致发光量子效率(PLQE)和光学增益对于光或电泵浦有机固态激光器是理想的。在这项工作中,通过在聚(9,9-)的骨架中引入少量(约占重量的约10%)2,5-二甲基-1,4-亚苯基(DP)单元来实现简单的自稀释效果。二辛基芴)(PFO)。与PFO(PLQE 39%)相比,所得共聚物表现出PLQE显着提高(66%),同时保持相似的吸收和光致发光特性,并伴随着光学增益特性的增强。这些共聚物的辐射衰减率急剧增加,同时非辐射衰减率持续降低,遵循溶液或聚合物基质中发光化合物物理稀释的相似原理。在所有共聚物中,含10%DP单元的共聚物表现出最低的自发发射/分布反馈激光阈值最低(10.9 nJ / 1.4 nJ,降低了八倍),并且最高增益系数(54.4 cm)-1)。结果表明,适度的DP /芴比率可以最大程度地发挥有益的自稀释作用。这些研究为实现同时具有高PLQE和大光学增益特性的共轭聚合物提供了新的设计策略。
更新日期:2020-06-19
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