Very Robust Spray-Synthesized CsPbI3Quantum Emitters with Ultrahigh Room-Temperature Cavity-Free Brightness and Self-Healing Ability

Bo Wei Hsu, Yung Tang Chuang, Chun Yuan Cheng, Chien Yu Chen, Yen Ju Chen, Alexandra Brumberg, Lin Yang, Yu Sheng Huang, Richard D. Schaller, Lih J. Chen, Chih Sung Chuu, Hao Wu Lin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Although colloidal lead halide perovskite quantum dots (PQDs) exhibit desirable emitter characteristics with high quantum yields and narrow bandwidths, instability has limited their applications in devices. In this paper, we describe spray-synthesized CsPbI3 PQD quantum emitters displaying strong photon antibunching and high brightness at room temperature and stable performance under continuous excitation with a high-intensity laser for more than 24 h. Our PQDs provided high single-photon emission rates, exceeding 9 × 106 count/s, after excluding multiexciton emissions and strong photon antibunching, as confirmed by low values of the second-order correlation function g(2)(0) (reaching 0.021 and 0.061 for the best and average PQD performance, respectively). With such high brightness and stability, we applied our PQDs as quantum random number generators, which demonstrably passed all of the National Institute of Standards and Technology's randomness tests. Intriguingly, all of the PQDs exhibited self-healing behavior and restored their PL intensities to greater than half of their initial values after excitation at extremely high intensity. Half of the PQDs even recovered almost all of their initial PL intensity. The robust properties of these spray-synthesized PQDs resulted from high crystallinity and good ligand encapsulation. Our results suggest that spray-synthesized PQDs have great potential for use in future quantum technologies (e.g., quantum communication, quantum cryptography, and quantum computing).

Original languageEnglish (US)
Pages (from-to)11358-11368
Number of pages11
JournalACS nano
Issue number7
StatePublished - Jul 27 2021


  • antibunching
  • brightness
  • perovskite quantum dot
  • quantum emitter
  • self-healing

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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