EPR and luminescence of u.v. irradiated PbCl2 and PbBr2 crystals

Gruijter, W.C. de; Kerssen, J.

doi:10.1016/0038-1098(72)90204-9

Cited by 17 publications

(3 citation statements)

References 10 publications

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“…Lead halides have many interesting properties due to their unique interactions with light. Indeed, it is known that lead halides can undergo processes, such as photolysis and photoluminescence, which are generically related to photoinduced electron-transfer processes. − Several studies focusing on these aspects are available, with special relevance for photoluminescence spectroscopy motivated by applications of lead halide crystals in scintillator detectors of high-energy radiation (such as γ and X-rays). , …”

Section: Introductionmentioning

confidence: 99%

Formation of Photoluminescent Lead Bromide Nanoparticles on Aluminoborosilicate Glass

Ruivo

Andrade²,

Rocha

et al. 2014

J. Phys. Chem. C

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A multicomponent aluminoborosilicate photoluminescent glass was synthesized by introducing Pb(II) and NaBr in its composition. The room-temperature photoluminescence is due to the existence of 4 nm nanocrystals, shown using TEM imaging and XRD analysis, which are assigned to PbBr 2 nanocrystals. The glasses display a broad emission band with a peak at 2.85 eV by exciting at 3.35 eV, with an anisotropy equal to 0.19 at room temperature. At 77 K, the emission intensity increases 1 order of magnitude and a vibronic structure appears, indicating an electron−phonon coupling with the glass matrix. Time-resolved luminescence measurements of these nanocrystals reveal mixed-order kinetics, with second-order recombination of self-trapped electron centers and a first-order temperature-dependent nonradiative rate constant connected with pathways due to confinement of self-trapped centers.

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Section: Introductionmentioning

confidence: 99%

Formation of Photoluminescent Lead Bromide Nanoparticles on Aluminoborosilicate Glass

Ruivo

Andrade²,

Rocha

et al. 2014

J. Phys. Chem. C

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“…However, in many cases, a transient Pb 2 3+ species, which exists as a self-trapped electron center (STEL), in pair with the halide, X 2 – , leads to a self-trapped hole (STH). Afterward, the reversed process generates an emissive self-trapped exciton (STE). − Lead halides photoluminescence has already been reported in different studies; however, to the best of our knowledge, a majority of these studies were performed at cryogenic temperatures, ,,,− because these crystals have limited stability at room temperature . In a previous study, where a multicomponent aluminoborosilicate photoluminescent glass was synthesized by doping with PbO and NaBr, it was reported that a photoluminescent glass matrix is obtained at room temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Lead halides materials, through charge transfer mechanisms, also lead to light emission and even photochemical reactions − (e.g., scintillator detectors of γ- and X-rays). , Organic lead halides perovskite solar cells have also attracted much attention because they are excellent sensitizers and their power conversion efficiencies are improving considerably in a short time. − More recently, in order to achieve more thermally stable materials, some work is focusing on the synthesis of completely inorganic lead halide perovskite solar cells …”

Section: Introductionmentioning

confidence: 99%

Photoluminescent Nanocrystals in a Multicomponent Aluminoborosilicate Glass

et al. 2016

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In this study, stable and nonexpensive aluminoborosilicate glasses with different photoluminescence colors were synthesized by doping with Pb(II), Ba(II) and sodium halides. While glasses with NaF and NaCl exhibit no (or very low) luminescence, glasses doped with NaBr and NaI display room-temperature photoluminescence at 435 and 530 nm, respectively. The observed room-temperature photoluminescence is attributed to nanocrystals whose presence is revealed by transmission electron microscopy. The crystalline nature of the particles, which are pointed out as barium-lead halides, is also revealed by anisotropy measurements for Br and I doped samples. Time-resolved luminescence measurements show a second-order kinetics component combined with a first-order nonradiative rate constant. The photoluminescence properties here described are important for the future design of new optical materials or devices based on lead halide nanocrystals.

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Lead Halide Post‐Perovskite‐Type Chains for High‐Efficiency White‐Light Emission

et al. 2019

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Hybrid metal halides containing perovskite layers have recently shown great potential for applications in solar cells and light‐emitting diodes. Such compounds exhibit quantum confinement effects leading to tunable optical and electronic properties. Thus, broadband white‐light emission has been observed from diverse metal halides and, owing to high color rendering index, high thermal stability, and low‐temperature solution processability, these materials have attracted interest for application in solid‐state lighting. However, the reported quantum yields for white photoluminescence (PLQY) remain low (i.e., in the range 0.5–9%) and no approach has shown to successfully increase the intensity of this emission. Here, it is demonstrated that the quantum efficiencies of hybrid metal halides can be greatly enhanced if they contain a polymorph of the [PbX4]2− perovskite‐type layers: the [PbX4]2− post‐perovskite‐type chains showing a PLQY of 45%. Different piperazines lead to a hybrid lead halide with either perovskite layers or post‐perovskite chains influencing strongly the presence of self‐trapped states for excitons. It is anticipated that this family of hybrid lead halide materials could enhance all the properties requiring the stabilization of trapped excitons.

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EPR and luminescence of u.v. irradiated PbCl2 and PbBr2 crystals

Cited by 17 publications

References 10 publications

Formation of Photoluminescent Lead Bromide Nanoparticles on Aluminoborosilicate Glass

Formation of Photoluminescent Lead Bromide Nanoparticles on Aluminoborosilicate Glass

Photoluminescent Nanocrystals in a Multicomponent Aluminoborosilicate Glass

Lead Halide Post‐Perovskite‐Type Chains for High‐Efficiency White‐Light Emission

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