Switching on near-infrared light in lanthanide-doped CsPbCl₃ perovskite nanocrystals

Abstract

The accessible emission spectral range of lead halide perovskite (LHP) CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) has remained so far limited to wavelengths below 1 μm, corresponding to...

Room temperature doping of Ln3+ in perovskite nanoparticles: a halide exchange mediated cation exchange approach

“…Noteworthy co-doped systems have also been reported, including CsPbCl 1.5 Br 1.5 :Yb 3+ ,Ce 3+ NPs which utilize quantum cutting to improve the photoelectric conversion efficiency of commercial silicon solar cells from 18.1% to 21.5%, 15 Yb 3+ -Er 3+ codoped CsPb(Cl 1−x Br x ) 3 NPs that use host sensitization to boost the Er 3+ emission at 1.5 μm for applications in telecommunications, 20 and Mn 2+ mediated energy transfer that switches on intense NIR emission for Nd 3+ , Ho 3+ , and Er 3+ in CsPbCl 3 :Mn 2+ , Ln 3+ [Ln = Nd, Ho, and Er] NPs. 21 An alternate protocol to the direct synthetic routes discussed for doping Ln 3+ in perovskite NPs can be envisioned via a post-synthetic procedure. The post-synthetic introduction of Ln 3+ in traditional II-VI semiconductor NPs and the investigation of their corresponding photophysical properties has been explored by us in detail.…”

“…Noteworthy co-doped systems have also been reported, including CsPbCl 1.5 Br 1.5 :Yb 3+ ,Ce 3+ NPs which utilize quantum cutting to improve the photoelectric conversion efficiency of commercial silicon solar cells from 18.1% to 21.5%, 15 Yb 3+ –Er 3+ codoped CsPb(Cl 1− x Br x ) 3 NPs that use host sensitization to boost the Er 3+ emission at 1.5 μm for applications in telecommunications, 20 and Mn 2+ mediated energy transfer that switches on intense NIR emission for Nd 3+ , Ho 3+ , and Er 3+ in CsPbCl 3 :Mn 2+ , Ln 3+ [Ln = Nd, Ho, and Er] NPs. 21…”

Cesium Manganese Bromide Nanocrystal Sensitizers for Broadband Vis-to-NIR Downshifting

“… 2 , 5 , 25 − 29 Various reports have shown that in lead halide perovskites a downshifted luminescence in the visible and infrared spectral range can be achieved through doping with divalent cations (for instance, Cd 2+ , Mn 2+ ), 30 , 31 trivalent cations (Ln 3+ ), 27 , 32 , 33 or a combination thereof. 28 Yet, the toxicity and stability issues of lead-based perovskites are a strong drive toward alternative metal halides, 34 − 37 and several Pb-free double perovskites (e.g., Cs 2 AgInCl 6 , 38 − 40 Cs 2 AgBiX 6 (X = Cl, Br), 39 , 41 and Cs 3 Bi 2 Br 9 39 ) have been synthesized and tested as hosts. Furthermore, most of these materials absorb only in the blue-visible range (<500 nm).…”

Research on the stability of luminescence of CsPbBr3 and Mn:CsPbBr3 PQDs in polar solution

“…In this work, we successfully synthesized partially Mn-doped CsPbBr 3 by hot injection technique. 35–42 Then we demonstrate the Mn:CsPbMnBr 3 PQDs with a Mn substitution ratio up to 38%. The introduction of Mn 2+ significantly increased the formation energy of Pb, Br, and Cs vacancies.…”