Amplified spontaneous emission, Purcell effect, lasing, and light emitting diodes from perovskite nanocrystal films

Inorganic perovskite nanocrystals have recently emerged as a highly promising material in light emission due to color tunability by chemical composition and quantum confinement, and bright emission from nanocrystal films with... [ view full abstract ]

Inorganic perovskite nanocrystals have recently emerged as a highly promising material in light emission due to color tunability by chemical composition and quantum confinement, and bright emission from nanocrystal films with photoluminescence quantum yields up to unity has been demonstrated. [1,2] In this talk the photo-physical properties of perovskite nanocrystal in solution and in thin films will be discussed. [3] We will show that a novel synthetic approach based on benzoyl halides leads to high PLQY and extremely low ASE thresholds (Fig. 1a,b). [4] Quantum confinement in CsPbBr3 nanoplatelets results in blue emission and films with 25 % PLQY are be obtained by spin-coating. The nanoplatelets in such films can be transformed to green emitting nanobelts by high intensity UV light exposure, as illustrated in Figure1c-d. The transformed films manifest extremely stable emission and are robust to treatment with different solvents, which enables the fabrication of all-solution processed light emitting diodes. [5] Furthermore, the plasmonic resonances of metal/dielectric multilayers can be used to enhance the emission and radiative rate of the fluorophore that in spincoated on their surface. We demonstrate four-fold emission enhancement of a film of CsPbBr₃ nanocubes deposited on such planar metamaterial structures, and highlight how the plasmonic resonances can be tuned to the emission and absorption bands of the emitter (Fig. 2).

References

[1]       L. Protesescu, S. Yakunin, M. I. Bodnarchuk, F. Krieg, R. Caputo, C. H. Hendon, R. X. Yang, A. Walsh, and M. V. Kovalenko, Nano Lett. 15, 3692 (2015).

[2]       S. Yakunin et al., Nat. Commun 6, 8056 (2015).

[3]       F. Di Stasio, M. Imran, Q. A. Akkerman, M. Prato, L. Manna, and R. Krahne, J. Phys. Chem. Lett. 8, 2725 (2017).

[4]       M. Imran, V. Caligiuri, M. Wang, L. Goldoni, M. Prato, R. Krahne, L. De Trizio, and L. Manna, J. Am. Chem. Soc. 140, 2656 (2018).

[5]       J. Shamsi, P. Rastogi, V. Caligiuri, A. L. Abdelhady, D. Spirito, L. Manna, and R. Krahne, ACS Nano 11, 10206 (2017).