Over 200 °C Broad‐Temperature Lasers Reconstructed from a Blue‐Phase Polymer Scaffold. Issue 47 (18th October 2022)

• Record Type: Journal Article
• Authors: Chen, Yujie; Zheng, Chenglin; Yang, Wenjie; Li, Jing; Jin, Feng; Li, Xiuhong; Wang, Jingxia; Jiang, Lei
• Is Part Of: Advanced materials. Volume 34:Issue 47(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-18
• Subjects: broad‐temperature lasers -- liquid crystals -- phase transitions -- polymer stabilized blue phase; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202206580
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Blue‐phase liquid crystal (BPLC) lasers have received extensive attention and have potential applications in sensors, displays, and anti‐counterfeiting, owing to their unique 3D photonic bandgap. However, the working temperature range of such BPLC lasers is insufficient, and investigations are required to elucidate the underlying mechanism. Herein, a broad‐temperature reconstructed laser is successfully achieved in dye‐doped polymer‐stabilized blue‐phase liquid crystals (DD‐PSBPLCs) with an unprecedented working temperature range of 25–230 °C based on a robust polymer scaffold, which combines the thermal stability and the tunability from the system. The broad‐temperature lasing stems from the high thermal stability of the robust polymerized system used, which affords enough reflected and matched fluorescence signals. The temperature‐tunable lasing behavior of the DD‐PSBPLCs is associated with the phase transition of the unpolymerized content (≈60 wt%) in the system, which endows with a reconstructed characteristic of BP lasers including a U‐shaped lasing threshold, a reversible lasing wavelength, and an obvious lasing enhancement at about 70 °C. This work not only provides a new idea for the design of broad‐temperature BPLC lasers, but also sets out important insight in innovative microstructure changes for novel multifunctional organic optic devices. Abstract : A broad lasing temperature range of 25–230 °C reconstructed from a blue‐phase polymer scaffold is presented. In addition, the corresponding mechanistic analysis for the wide lasing temperature range is also investigated, i.e., a matched reflection and fluorescence spectra, a robust BP structure, a persistent life time of dye, etc.