High-stability inorganic perovskite quantum dot–cellulose nanocrystal hybrid films

Abstract

Inorganic perovskite quantum dots (IPQDs) such as cesium lead halide (CsPbX3, X = Cl, Br and I) quantum dots have attracted much attention for developing cadmium-free quantum light-emitting displays (QLEDs) based on outstanding light emission properties including narrow full width at half maximum (FWHM), tunable bandgap and ultrahigh (>90%) photoluminescence quantum yield (PLQY). Nevertheless, their poor stability under ambient conditions, at high temperature or under continuous light irradiation is the main problem for practical applications. In this study, a new method is proposed to effectively stabilize CsPbBr3 IPQDs by synthesizing them with sulfate-functionalized cellulose nanocrystals (CNCs) at room temperature without using traditional quantum dot stabilizers such as oleylamine (OLA) and oleic acid (OA). The as-prepared CsPbBr3 IPQD/CNC hybrid paper-like films are highly stable and the relative photoluminescence (PL) intensity can be maintained at 92% under continuous UV light (306 nm, 15 W) illumination for 130 h, >99% at high temperature (100 °C) for 130 h, and >99% in ambient conditions for 15 d. Additionally, the PLQY and FWHM of IPQD/CNC are 45.69% and 22 nm, respectively. The ultrahigh stability and narrow FWHM characteristics proposed here for IPQD/CNC hybrid films can provide new possibilities for practical applications in the future development of IPQD-related devices.

Full‐Color Perovskite Quantum Dots/Cellulose Nanocrystals Enhancement Films with Excellent Stability

“…It has been shown in our previous study that sulfate‐functionalized CNC can significantly improve the stability of CsPbBr 3 PQD/CNC and CH 3 NH 3 PbBr 3 PQD/CNC films. [ 21,22 ] To further show the effective stabilization of sulfate‐functionalized CNC on PQDs, we conducted X‐ray photoelectron spectroscopy (XPS) analysis on both OA/OLA‐capped PQDs and PQD/CNC. As shown in Figure S5a, Supporting Information, the Pb 4 f spectrum of OA/OLA‐capped PQD with two contributions of 4 f 7/2 and 4 f 5/2 has been identified at 138.80 and 143.65 eV, respectively.…”

“…[ 21 ] In addition, we have also shown in our previous studies that Br‐based PQDs/cellulose nanocrystal (CNC) films with largely improved stability can be well achieved through matrix encapsulation and effective stabilization with organosulfate functional groups of CNCs. [ 22,23 ] However, for red‐emitting I‐based PQDs, the decomposition/degradation becomes more severe wherein strategies besides ligand engineering and matrix encapsulation should be considered for long‐term applications.…”

Cellulose as an Eco-Friendly and Sustainable Material for Optical Anticounterfeiting Applications: An Up-to-Date Appraisal

“… 77 − 80 These CNFs are explored to design and construct advanced materials through surface modification by doping with organic/inorganic small molecules/materials, either by physical or chemical modifications. 81 , 82 Various luminescent materials, including up-conversion nanoparticles (UCNPs), dyes, CdS quantum dots, and La-based complexes, have been effectively used to modify nanocellulose for diverse antiforgery applications.…”

“…They are ideal building blocks to host a wide variety of guest materials for developing CNF-based flexible matrices. These rod-shaped nanomaterials are becoming popular in the anticounterfeiting arena due to large surface area, plentiful hydroxyl groups, easy modification prospects, distinct rheological properties, low thermal expansion coefficient, high mechanical modulus and strength, good biocompatibility, and renewability. − These CNFs are explored to design and construct advanced materials through surface modification by doping with organic/inorganic small molecules/materials, either by physical or chemical modifications. , Various luminescent materials, including up-conversion nanoparticles (UCNPs), dyes, CdS quantum dots, and La-based complexes, have been effectively used to modify nanocellulose for diverse antiforgery applications.…”

Cellulose-inorganic hybrids of strongly reduced thermal conductivity

“…Nanocellulose has been topical for the past 10-15 years in materials research that has capitalized on its advanced mechanical properties (Aitomäki et al 2014), high surface area (Phanthong et al 2018), low toxicity (Endes et al 2016) and low thermal conductivity (Hori et al 2005;Uetani et al 2017;Wicklein et al 2015) among others. In fact, the thermal stability of nanocellulose has been extensively studied via themogravimetric (TG) techniques, exhibiting structural integrity up to 200 °C, (Lu et al 2020;Zhang et al 2018Zhang et al , 2019 rendering it as an excellent component in hybrid structures, suitable for mildly elevated temperatures (Chiang et al 2020;Sadasivuni et al 2016). Furthermore, energy related applications, such as supercapacitors (Zu et al 2016;Jose et al 2019) have gained ground.…”