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Using bulk-like nanocrystals to probe intrinsic optical gain characteristics of inorganic lead halide perovskites

Pieter Geiregat (UGent) , Jorick Maes (UGent) , Kai Chen, Emile Drijvers (UGent) , Jonathan De Roo (UGent) , Justin Hodgkiss and Zeger Hens (UGent)
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Abstract
Following the introduction of perovskites for photovoltaic solar energy conversion, the use of these materials as a general purpose optoelectronic material for displays, lighting, and lasing has been explored. However, while reports on stimulated emission and lasing by perovskites show great promise, a comprehensive quantification of their optical gain characteristics is lacking. Here, we measure gain coefficients, clarify the gain mechanism, and explore the gain dynamics of colloidal CsPbBr3 nanocrystals by deploying a unique combination of broadband transient absorption and ultrafast fluorescence spectroscopy. Opposite from current literature, we show that optical gain in such nanocrystals is supported by stimulated emission from free carriers, and not from excitons or biexcitons. Importantly, we demonstrate that the concomitant gain coefficients and thresholds agree with literature results reported for perovksite thin films. Finally, we show that, even in the case of fully inorganic lead halide perovskites, a cooling bottleneck hampers the development of net stimulated emission at high excitation density. Based on these results, we propose that bulk-like colloidal nanocrystals in general offer a unique testbed to quantify optical gain of novel photonic materials and in particular for lead halide perovskites.

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Chicago
Geiregat, Pieter, Jorick Maes, Kai Chen, Emile Drijvers, Jonathan De Roo, Justin Hodgkiss, and Zeger Hens. 2019. “Using Bulk-like Nanocrystals to Probe Intrinsic Optical Gain Characteristics of Inorganic Lead Halide Perovskites.” In E-MRS Spring Meeting Presentations.
APA
Geiregat, P., Maes, J., Chen, K., Drijvers, E., De Roo, J., Hodgkiss, J., & Hens, Z. (2019). Using bulk-like nanocrystals to probe intrinsic optical gain characteristics of inorganic lead halide perovskites. E-MRS Spring meeting presentations. Presented at the E-MRS Spring meeting 2019 ; Symposium G: Halide perovskites : low dimensions for devices.
Vancouver
1.
Geiregat P, Maes J, Chen K, Drijvers E, De Roo J, Hodgkiss J, et al. Using bulk-like nanocrystals to probe intrinsic optical gain characteristics of inorganic lead halide perovskites. E-MRS Spring meeting presentations. 2019.
MLA
Geiregat, Pieter et al. “Using Bulk-like Nanocrystals to Probe Intrinsic Optical Gain Characteristics of Inorganic Lead Halide Perovskites.” E-MRS Spring Meeting Presentations. 2019. Print.
@inproceedings{8617525,
  abstract     = {Following the introduction of perovskites for photovoltaic solar energy conversion, the use of these materials as a general purpose optoelectronic material for displays, lighting, and lasing has been explored. However, while reports on stimulated emission and lasing by perovskites show great promise, a comprehensive quantification of their optical gain characteristics is lacking. Here, we measure gain coefficients, clarify the gain mechanism, and explore the gain dynamics of colloidal CsPbBr3 nanocrystals by deploying a unique combination of broadband transient absorption and ultrafast fluorescence spectroscopy. Opposite from current literature, we show that optical gain in such nanocrystals is supported by stimulated emission from free carriers, and not from excitons or biexcitons. Importantly, we demonstrate that the concomitant gain coefficients and thresholds agree with literature results reported for perovksite thin films. Finally, we show that, even in the case of fully inorganic lead halide perovskites, a cooling bottleneck hampers the development of net stimulated emission at high excitation density. Based on these results, we propose that bulk-like colloidal nanocrystals in general offer a unique testbed to quantify optical gain of novel photonic materials and in particular for lead halide perovskites.},
  author       = {Geiregat, Pieter and Maes, Jorick and Chen, Kai and Drijvers, Emile and De Roo, Jonathan and Hodgkiss, Justin  and Hens, Zeger},
  booktitle    = {E-MRS Spring meeting presentations},
  language     = {eng},
  location     = {Nice, France},
  title        = {Using bulk-like nanocrystals to probe intrinsic optical gain characteristics of inorganic lead halide perovskites},
  url          = {https://www.european-mrs.com/halide-perovskites-low-dimensions-devices-emrs},
  year         = {2019},
}