Photoluminescence of Cs4PbBr6 crystals and thin films

Nikl, M.; Mihóková, E.; Nitsch, K.; Somma, Fabrizia; Giampaolo, C.; Pazzi, G.P.; Fabeni, P.; Zazubovich, S.

doi:10.1016/s0009-2614(99)00477-7

Cited by 167 publications

(207 citation statements)

References 16 publications

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“…We assume that they could be similar to the states of some stable lead-related compounds. Up to now, the characteristics of four types of alkali-metal lead bromides: Cs 4 PbBr 6 [20], PbBr 2 [21,22], RbPb 2 Br 5 [22] and CsPbBr 3 [22,23], are studied whose absorption has been ascribed to the transitions between the Pb 2+ ion states. We have compared the luminescence characteristics of Pb 2+ centres in CsBr : Pb with those of Cs 4 PbBr 6 , CsPbBr 3 , PbBr 2 , and RbPb 2 Br 5 single crystals (it is impossible to prepare a CsPb 2 Br 5 single crystal due to the incongruent melting) and found that they are really similar (see Table 2).…”

Section: Discussionmentioning

confidence: 99%

Relaxed Excited States Origin and Structure in Lead-Doped Caesium Bromide

Aceves

Babin

Barboza-Flores

et al. 2001

phys. stat. sol. (b)

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Absorption, emission and excitation spectra, polarization and decay kinetics of luminescence and their temperature dependences have been studied at 4.2-300 K for several CsBr : Pb samples with various lead concentrations. The origin and structure of the relaxed excited states responsible for the 3.33, 2.8 and 2.43 eV emission bands have been discussed. It has been concluded that the relaxed excited state model proposed for Tl + -doped caesium halides and CsCl : Pb is not valid in case of CsBr : Pb. To establish the origin of the relaxed excited states in a CsBr : Pb crystal, the luminescence characteristics of CsBr : Pb have been compared with those reported for Cs 4 PbBr 6 , PbBr 2 and CsPbBr 3 bulk crystals. It has been assumed that owing to a strong interaction between Pb 2+ and Br --ions, the molecular-like states, which are similar to the excited levels of some stable lead-related compounds, are responsible for the luminescence of CsBr : Pb crystals.

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Section: Discussionmentioning

confidence: 99%

Relaxed Excited States Origin and Structure in Lead-Doped Caesium Bromide

Aceves

Babin

Barboza-Flores

et al. 2001

phys. stat. sol. (b)

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“…Pb-Br 1,2,3,4,5,6 3.0281(5) Cs(2)-Br 11,1,3,14,15, 6 3.5657(6) Cs(1)-Br 7, 8 3.6943(6) Cs(1)-Br 9, 10 3.7019(6) Cs(1)-Br 6, 11 3.7497(6) Cs(1)-Br 12, 13 3.8243 (7) thick after manual polishing. The Pr 3+ ions content that was measured in the crystal displayed in Fig.…”

Section: Bond Distance (å )mentioning

confidence: 99%

“…Cs 4 PbBr 6 is a long-time known bromide [9] that, among several alkalibased lead bromides, has been investigated in the form of bulk crystals and thin films for its particular optical properties arising from the 6s 2 Pb 2+ cations electronic outer shell [10,11]. In the course of our experiments, we became interested in doping this material with Pr 3+ cations in order to investigate its spectroscopical properties in the 1-5 mm spectral range.…”

Section: Introductionmentioning

confidence: 99%

Growth and characterization of pure and Pr3+-doped Cs4PbBr6 crystals

Velázquez

Ferrier

Péchev

et al. 2008

Journal of Crystal Growth

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“…Owing to the isolated [BX 6 ] 4− octahedra, the A 4 BX 6 phase is also described as 0D perovskite. Therefore the rhombic prism Cs 4 PbBr 6 was usually considered as a wide-gap semiconductor with a bandgap of about 3.9 eV, [113,119] the green emission from pristine Cs 4 PbBr 6 single crystallites was suspected as an effect of defects or impurities, due to lack of evidence for the existence of CsPbBr 3 phases. [74,112] On the other hand, it was confirmed that endotaxial synthesis of CsPbBr 3 NCs within the Cs 4 PbBr 6 compound was feasible since the lattice structure of CsPbBr 3 matches well with the lattice of Cs 4 PbBr 6 when rotates at a certain angle.…”

Section: In Situ Fabricated Pncs Embedded In Crystalline Matrixmentioning

confidence: 99%

In Situ Fabricated Perovskite Nanocrystals: A Revolution in Optical Materials

Chang

Bai

Zhong

2018

Advanced Optical Materials

192

127

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in bulk halide perovskites, long carrier diffusion length, and an absorption range covering the visible solar spectrum, collectively enable the high performance of photo electricity conversion. Compared to the bulk materials, perovskite nanocrystals or quantum dots (usually denoted as PNCs or PQDs) show obvious excitonic features with enhanced photoluminescence (PL) properties due to the well-known size-dependent quantum confinement effects. [14][15][16][17] The combination of color saturated emissions, super high quantum yield (QY), as well as easy processing inspired the intensive exploration of PNCs as light emitters, which is now under spotlights in the field of optical materials.The first perspective aim of PNCs is to alternate the state-of-the-art CdSe or InP quantum dots (QDs) as new generation luminescence materials. [18,19] As shown in Figure 1, these QD materials have been well demonstrated to be potential functional components for photonic and optoelectronic applications, and are currently on the way to industrialization. [20][21][22][23] Specifically, QDs can be employed as fluorescence labels, [24] laser gain media, [25] LED phosphors, [26] and down-shifting films for LCD backlights. [27,28] They can also be processed into thin film for optoelectronic devices including solar cells, [29] photodetectors, [30,31] transistors [32] and LEDs. [33] The PNCs outcompete these conventional QDs in terms of narrower full width at half maximum (FWHM) and low fabrication cost, but most importantly, the ease of in situ preparation. [34,35] Herein, this progress report highlight the developments of in situ fabricated PNCs.Colloidal semiconductor QDs are typically synthesized ex situ in flasks by hot injection method, stabilized by surface ligands. [36][37][38][39] To incorporate such solution based materials into applications usually requires purification, redispersion and surface engineering. For instance, ligand exchange is often employed to disperse QDs into aimed solvent, inducing defects that inevitably derogating the PLQYs. [40] Moreover, the organic ligands themselves also suffer from the risk of disabsorbing, reducing the stability of the QDs and thus the final devices. [41] Because halide perovskite are ionic compounds that can be well dissolved into polar solvents, PNCs can be fabricated through either ex situ routes in flask or in situ strategies on substrates. The in situ fabricated PNCs are adaptable to devices integration due to their scalable and low-cost manufacturing. In this regard, more and more efforts have been made in terms of the controlling synthesis, physical properties and device applications of PNC materials.After over 30 years of development, colloidal quantum dots have now become mature luminescent materials in photonic and optoelectronic operations and start to hit the market. The emerging perovskite nanocrystals are expected to promote large-scale commercialization due to their superior optical properties as well as low cost and easy fabrication. This progress report is focused on the...

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Photoluminescence of Cs4PbBr6 crystals and thin films

Cited by 167 publications

References 16 publications

Relaxed Excited States Origin and Structure in Lead-Doped Caesium Bromide

Relaxed Excited States Origin and Structure in Lead-Doped Caesium Bromide

Growth and characterization of pure and Pr3+-doped Cs4PbBr6 crystals

In Situ Fabricated Perovskite Nanocrystals: A Revolution in Optical Materials

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