Cyanuric Acid-Functionalized
Perovskite Nanocrystals
toward Low Interface Impedance, High Environmental Stability, and
Superior Electrochemiluminescence
posted on 2024-01-31, 05:13authored byYifei Yue, Xingzi Zou, Lihui Liu, Xuejing Liu, Baohua Zhang, Bolin Zhao, Mei Chen, Yuxuan Fu, Yuwei Zhang, Li Niu
Perovskite nanocrystals (PNs) have received much attention
as luminescence
materials in the field of electrochemiluminescence (ECL). However,
as one key factor for determining the optoelectronic properties of
the surface state of PNs, the surface passivation layer of PNs has
enormous difficulty in simultaneously meeting the requirements of
high ECL efficiency, conductivity, and stability. Herein, an effective
surface modification strategy with cyanuric acid (CA) is used to solve
such issue. As confirmed, the CA molecules are chemically anchored
onto the surface of PNs via the Lewis interaction between π
electrons of the triazine ring and the empty orbit of Pb2+. Benefiting from the above interaction, the electrochemical impedance
of PNs is decreased greatly without the loss of light-emitting efficiency.
Moreover, the stability of PNs under O2 exposure is improved
by almost sixfold. These improvements are confirmed to be beneficial
for enhancing the ECL behaviors of PNs under electrochemical operation.
Upon cathode ECL driving conditions in aqueous media, the ECL intensity
and efficiency of PNs are increased to 200 and 170%, respectively.
This work provides a new modification strategy to holistically improve
the ECL performance of PNs, which is instructive to exploring robust
perovskite nanomaterials for electrochemical applications.