Fluorescence Blinking Beyond Nanoconfinement: Spatially Synchronous Intermittency of Entire Perovskite Microcrystals

Nithin Pathoor, Ansuman Halder, Amitrajit Mukherjee, Jaladhar Mahato, Shaibal K. Sarkar, Arindam Chowdhury

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Abrupt fluorescence intermittency or blinking is long recognized to be characteristic of single nano-emitters. Extended quantum-confined nanostructures also undergo spatially heterogeneous blinking; however, there is no such precedent in dimensionally unconfined (bulk) materials. Herein, we report multi-level blinking of entire individual organo–lead bromide perovskite microcrystals (volume=0.1–3 μm3) under ambient conditions. Extremely high spatiotemporal correlation (>0.9) in intracrystal emission intensity fluctuations signifies effective communication amongst photogenerated carriers at distal locations (up to ca. 4 μm) within each crystal. Fused polycrystalline grains also exhibit this intriguing phenomenon, which is rationalized by correlated and efficient migration of carriers to a few transient nonradiative traps, the nature and population of which determine blinking propensity. Observation of spatiotemporally correlated emission intermittency in bulk semiconductor crystals opens the possibility of designing novel devices involving long-range (mesoscopic) electronic communication.

Original languageEnglish
Pages (from-to)11603-11607
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number36
StatePublished - 3 Sep 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim


Financial support provided by Solar Energy Research Institutes of India and US (SERIIUS) and Ministry of New and Renewable Energy (MNRE), Govt. of India. A.C. thanks the National Center for Photovoltaic Research and Education (NCPRE), aided by MNRE for partial financial support. Authors acknowledge IRCC and CRNTS, IIT Bombay for usage of central facility equipment. N.P. and A.M. acknowledge fellowships from CSIR (India). A.C. thanks Subhabrata Dhar, Siuli Mukhopadhyay, Amitabha Tripathi, and the Kaleidoscope-2017 meeting for valuable discussions.

FundersFunder number
Ministry of New and Renewable Energy India
Council of Scientific and Industrial Research, India
National Centre for Photovoltaic Research and Education


    • concerted blinking
    • correlated carrier migration
    • hybrid perovskites
    • long-range communication
    • transient traps


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