Yb³⁺‐Doped Phenylethylammonium Lead Bromide 2D Layered Hybrid Perovskite for Near‐Infrared Emission

Abstract

Two‐dimensional (2D) layered hybrid perovskites like phenylethylammonium lead bromide [(PEA)2PbBr4] show interesting optoelectronic properties and improved moisture stability owing to the repeating quantum‐well structure and hydrophobic organic cations, respectively. Doping metal ions in such perovskites leads to exciton‐dopant interactions, imparting new optical properties. Here we report synthesis and optical properties of Yb3+‐doped (PEA)2PbBr4. Crystals show plate‐like morphology with lateral size of few micrometers. Also, ∼3.5 nm thin nanoplatelets are obtained after sonicating the samples. The host absorbs light via excitonic (and band‐band) transition at 407 nm. A part of the generated excitons recombines by emitting light at 414 nm along with host‐related non‐radiative recombination. Another significant part of the excitons recombines by non‐radiatively transferring the energy to the f‐electrons of Yb3+ dopant ions. The Yb3+ ions then de‐excite via f‐f (2F5/2→2F7/2) transition emitting near‐infrared (NIR) radiation with a peak at 997 nm. Such NIR‐emitting semiconductors with improved performances are desired for NIR light‐emitting diode applications.

Edge versus Interior Mn2+ Doping in 2D Layered Butylammonium Lead Bromide Perovskite Single Crystals

“…Consequently, the energy transfer efficiency (particularly from interior excitons) is nominal, yielding significant exciton emissivity in the PL spectrum of Mn 2+ -doped samples. We note here that recent reports suggest that doping lanthanide ions in such layered 2D perovskites is also very difficult along with inefficient host-to-dopant energy transfer. , …”

Recent Progress of Organic–Inorganic Hybrid Perovskite Quantum Dots: Preparation, Optical Regulation, and Application in Light‐Emitting Diodes

“…It is worth men-tioning that the synthesized quantum dots can be stably stored for at least 8 months in a refrigerator (under dark conditions and 4 °C) and maintain a significant PLQY of 72%, as shown in Figure 6f. Nag et al [54] reported the synthesis and optical properties of Yb 3+ doped (PEA) 2 PbBr 4 with ≈3.5 nm thin nanosheets. The intrinsic exciton emission intensity at ≈414 nm decreases systematically with increasing doping concentration (Figure 6g).…”

“…Nag et al. [ 54 ] reported the synthesis and optical properties of Yb 3+ doped (PEA) 2 PbBr 4 with ≈3.5 nm thin nanosheets. The intrinsic exciton emission intensity at ≈414 nm decreases systematically with increasing doping concentration (Figure 6g).…”

“…The PL spectra of Yb 3+ doped (PEA) 2 PbBr 4 with different dopant concentrations in g) UV-visible and h) NIR region. Reproduced with permission [54]. Copyright 2022, Wiley-VCH.…”

Near-infrared two-photon excited photoluminescence from Yb3+-doped CsPbClxBr3−x perovskite nanocrystals embedded into amphiphilic silica microspheres

“…Apart from the Yb 3+ -related NIR emission, variation in the anion composition of a host perovskite matrix helps to tune the position of their band-edge (BE) emission, making these nanostructures versatile dual-band emitters. To date, development of Yb 3+ -doped perovskite NCs included novel synthetic approaches, 21–25 applications in solar harvesting, 26,27 light detection 22 and light-emitting 28–31 devices, as well as a deeper understanding of the fundamental processes governing the photoexcitation dynamics in these nanostructures. 32,33 While TPA-excited photoluminescence (PL) from perovskite NCs has been studied in detail, less attention has been given to multiphoton-excited PL from the dopant ions, mostly limited to Mn 2+ dopants.…”