Strong two-photon absorption of Mn-doped CsPbCl3 perovskite nanocrystals

Abstract

Emerging CsPbX 3 (X ¼ Cl, Br, and I) perovskite nanocrystals (NCs) have been demonstrated to be efficient emitters with a high fluorescence quantum yield, making these materials interesting for optical applications as well as for fundamental physics. Interestingly, doping with transition metal ions has been extensively explored as a way of introducing new optical, electronic, and magnetic properties, making perovskite NCs much more functional than their undoped counterparts. However, there have been no reports regarding the nonlinear optical properties of transition metal ion doped perovskite NCs. Herein, by using femtosecond-transient absorption spectroscopy, we have determined the one-photon linear absorption cross-section ($1.42 Â 10 À14 cm 2) of Mn-doped CsPbCl 3 NCs ($11.7 6 1.8 nm size, $0.2% doping concentration, and $600 nm emission wavelength). More importantly, their nonlinear optical properties-in particular, the two-photon absorption (TPA) and resultant emission-were investigated. Notably, the NCs exhibit wavelength-dependent TPA with a maximum value up to $3.18 Â 10 5 GM at a wavelength of 720 nm. Our results indicate that Mn-doped CsPbCl 3 NCs show promise in nonlinear optical devices and multiphoton fluorescence lifetime imaging.

2D Layered Materials: Synthesis, Nonlinear Optical Properties, and Device Applications

“…The saturable absorption and multiple‐photon absorption are two kinds of nonlinear absorption. It is worth noting that if the laser intensity is very high, multi‐photon absorption becomes very important . If two‐photon absorption is considered, the saturable absorption formula can be derived from …”

Optical studies of semiconductor perovskite nanocrystals for classical optoelectronic applications and quantum information technologies: a review

“…The two-photon absorption cross sections have been estimated for ensemble perovskite NCs by means of collection efficiency, 108,160 Z-scan, 107,109,[160][161][162] and TA 163 measurements.…”

Doping and phase segregation in Mn2+- and Co2+-doped lead halide perovskites from133Cs and1H NMR relaxation enhancement

“…7,8 All-inorganic lead halide perovskite quantum dots (QDs) doped with transition metal and lanthanide ions show particularly advantageous optoelectronic properties such as strongly sensitized luminescence 9,10 and improved thermal and air stability. 11,12 The most widely investigated materials are CsPbCl 3 , 10,[13][14][15][16][17][18][19][20][21][22] CsPbBr 3 , [23][24][25][26] and CsPbI 3 , 9,12 as well as mixedhalide compositions 10,[27][28][29] doped with Mn 2+ and very recently Ce 3+ . 30 The strategy of transition metal ion doping has also been proposed as a means of ne tuning of photovoltaic parameters in organic-inorganic lead halide perovskites.…”