TY - JOUR
T1 - Encapsulation of Perovskite Nanocrystals into Macroscale Polymer Matrices
T2 - Enhanced Stability and Polarization
AU - Raja, Shilpa N.
AU - Bekenstein, Yehonadav
AU - Koc, Matthew A.
AU - Fischer, Stefan
AU - Zhang, Dandan
AU - Lin, Liwei
AU - Ritchie, Robert O.
AU - Yang, Peidong
AU - Alivisatos, A. Paul
PY - 2016/12/28
Y1 - 2016/12/28
N2 - Lead halide perovskites hold promise for photonic devices, due to their superior optoelectronic properties. However, their use is limited by poor stability and toxicity. We demonstrate enhanced water and light stability of high-surface-area colloidal perovskite nanocrystals by encapsulation of colloidal CsPbBr3 quantum dots into matched hydrophobic macroscale polymeric matrices. This is achieved by mixing the quantum dots with presynthesized high-molecular-weight polymers. We monitor the photoluminescence quantum yield of the perovskite-polymer nanocomposite films under water-soaking for the first time, finding no change even after >4 months of continuous immersion in water. Furthermore, photostability is greatly enhanced in the macroscale polymer-encapsulated nanocrystal perovskites, which sustain >1010 absorption events per quantum dot prior to photodegradation, a significant threshold for potential device use. Control of the quantum dot shape in these thin-film polymer composite enables color tunability via strong quantum-confinement in nanoplates and significant room temperature polarized emission from perovskite nanowires. Not only does the high-molecular-weight polymer protect the perovskites from the environment but also no escaped lead was detected in water that was in contact with the encapsulated perovskites for months. Our ligand-passivated perovskite-macroscale polymer composites provide a robust platform for diverse photonic applications.
AB - Lead halide perovskites hold promise for photonic devices, due to their superior optoelectronic properties. However, their use is limited by poor stability and toxicity. We demonstrate enhanced water and light stability of high-surface-area colloidal perovskite nanocrystals by encapsulation of colloidal CsPbBr3 quantum dots into matched hydrophobic macroscale polymeric matrices. This is achieved by mixing the quantum dots with presynthesized high-molecular-weight polymers. We monitor the photoluminescence quantum yield of the perovskite-polymer nanocomposite films under water-soaking for the first time, finding no change even after >4 months of continuous immersion in water. Furthermore, photostability is greatly enhanced in the macroscale polymer-encapsulated nanocrystal perovskites, which sustain >1010 absorption events per quantum dot prior to photodegradation, a significant threshold for potential device use. Control of the quantum dot shape in these thin-film polymer composite enables color tunability via strong quantum-confinement in nanoplates and significant room temperature polarized emission from perovskite nanowires. Not only does the high-molecular-weight polymer protect the perovskites from the environment but also no escaped lead was detected in water that was in contact with the encapsulated perovskites for months. Our ligand-passivated perovskite-macroscale polymer composites provide a robust platform for diverse photonic applications.
KW - hydrophobic polymer
KW - light and water stability
KW - nanocomposite polarization
KW - nanowires and nanoplates
KW - perovskite quantum dot nanocrystals
KW - photon budget
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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85008331024&origin=recordpage
U2 - 10.1021/acsami.6b09443
DO - 10.1021/acsami.6b09443
M3 - RGC 21 - Publication in refereed journal
SN - 1944-8244
VL - 8
SP - 35523
EP - 35533
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 51
ER -