Air Stable Organic–Inorganic Perovskite Nanocrystals@Polymer Nanofibers and Waveguide Lasing

Abstract

Hybrid organic-inorganic perovskites have attracted wide attentions owing to their potent optoelectronic applications associated with their unique features of excitons such as long carrier lifetime and diffusion length. [1,2] Since the discovery of Organic-inorganic hybrid perovskites have been considered as promising gain materials for lasing. Despite previous reports of lasing from nanocrystals, thin films and single crystals, the stability of perovskite lasers has been a challenge for its practical applications. Herein, a scalable strategy to prepare ultrastable perovskite@polymer hybrid fibers by employing a facile emulsion electrospinning approach is demonstrated. During the electrospinning process, polymethyl methacrylate (PMMA) first solidifies into an outer shell layer. Meanwhile, emulsion drops containing poly(vinylidene fluoride) (PVDF) and perovskite precursor are pushed inward and evolve into perovskite nanocrystals covered by PVDF. The PMMA with smooth surface benefits the light transport and the water-resistant PVDF blocks the moisture. The methylammonium lead bromide perovskite-embedded fibers can emit intensive light after storage in humid ambient environment (relative humidity >60%) or even in water. Amplified spontaneous emissions from the fibers network and waveguide lasing from chopped single fiber is demonstrated.

Interface Chemical Modification between All-Inorganic Perovskite Nanocrystals and Porous Silica Microspheres for Composite Materials with Improved Emission

“…From the view of lasing applications, the control of the shape of the host matrix in order to vary the shape from fibers to spheres meeting the resonance conditions for further observation of amplified spontaneous emission (ASE) and lasing is needed [20,21]. In recent work [22], it was shown that the fibers based on composites made with pNCs and polymers (polymethyl methacrylate and poly(vinylidene fluoride)) had stable optical responses at humidity at 60% and performed ASE and waveguide lasing. He et al presented the fabrication of SiN nanoscale cavity covered by pNCs mixed with PMMA which showed lasing with Q-factor of 1.5 × 10 4 and threshold at 5.62 µJ/cm 2 [23].…”

Fiber Optofluidic Microlasers: Structures, Characteristics, and Applications

“…[128,229] Electrospinning is another scalable strategy to massively fabricate the polymer microfibers. [230] Based on this facile approach, Zhang et al prepared plasmonic enhanced polymer microfibers and demonstrated its ultrahigh sensitivity to the relative humidity and scetic acid gas. Thanks to the excellent fabric compatibility, the microfibers can be woven into the clothes to fabricate a wearable sensor (Figure 14c).…”

Robust and Flexible Random Lasers Using Perovskite Quantum Dots Coated Nickel Foam for Speckle‐Free Laser Imaging

“…Recently, extensive investigations have been concentrated on the realization of lasers on the plastic substrate due to their mechanical flexible characteristics suitable for the development of flexible optoelectronic systems. [1][2][3][4][5] For example, the deposition of ZnO nanoparticle embedded ZnO thin film on polycarbonate plastic substrate is proposed to realize flexible inorganic random lasers. [6] Organic lasers using solvent-free fluidic organic semiconductors as the gain medium, and highly flexible corrugated polymeric patterns and flexible polyurethane acrylate films as the resonator have also achieved mechanically single-mode tunable lasers.…”