Cesium-trihalogen-plumbates a new class of ionic semiconductors

Fröhlich, D.; Heidrich, K.; Künzel, H.; Trendel, G.; Treusch, J.

doi:10.1016/0022-2313(79)90146-7

Cited by 72 publications

(55 citation statements)

References 5 publications

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“…Then the film was annealed at 500 K for 10 min, and cooled again to 77 K to measure spectrum c. Spectrum a is composed of two broad bands peaking at 3.87 and 5.23 eV. By annealing the film, a sharp excitonic peak shows up at 2.357eV characteristic of crystalline CsPbBr 3 [12,13], as seen from spectrum c.…”

Section: Methodsmentioning

confidence: 99%

Extended versus Localized Electronic States in Amorphous TlX and CsPbX3 Films (X = Br, Cl) Studied by Optical Absorption Measurements

Kondo¹

1999

phys. stat. sol. (a)

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Section: Methodsmentioning

confidence: 99%

Extended versus Localized Electronic States in Amorphous TlX and CsPbX3 Films (X = Br, Cl) Studied by Optical Absorption Measurements

Kondo¹

1999

phys. stat. sol. (a)

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“…For CsPbBr, the corresponding transition between Br-and Pb2+ has been reported a t about 3.9 eV [14]. For the higher charged Bi3+ ion this transition is in fact expected at lower energies.…”

Section: Excitation Spectramentioning

confidence: 93%

“…Free exciton recombination has also been observed for the thallous halides near the direct band gap transitions [3], whereas the exciton emission near the indirect gap has been ascribed to bound excitons in [3], but to free excitons in [all. For the cesium lead halides a free exciton line has been reported in the emission of CsPbC1, [14].…”

Section: Emission Spectramentioning

confidence: 98%

On the Luminescence of Cs₃Bi₂Br₉ Single Crystals

Timmermans

Blasse

1981

Physica Status Solidi (b)

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The luminescence properties of Cs,Bi,Br, single crystals are reported. Cs,Bi,Br, is an ordered perovskite, structurally and electronically related to the cesium lead halides. Emission and excitation spectra are measured a t 4.2 K. The luminescence originates from the recombination of excitons bound to defects, except for a sharp line a t 459.2 nm, which is ascribed to free exciton recombination. The band-gap transition takes place a t about 2.7 eV and is found to be direct and allowed. The intensity of the emission bands and the decay times are measured as a function of temperature. The results are interpreted assuming detrapping and exciton migration.Es wird iiber die Lumineszenz von Cs,Bi,Br,-Einkristallen berichtet. Cs,Bi,Br9 hat eine geordnete Perovskitstruktur und ist sowohl strukturell als auch elektronisch verwandt mit den Casiumtrihalogenoplumbaten. Emissions-und Anregungsspektren werden bei 4,2 K aufgenommen. Die Lumineszenz riihrt von der Rekombination von an Storstellen gebundenen Exzitonen her, ausgenommen eine scharfe Spektrallinie bei 459,2 nm, welche der Rekombination freier Exzitonen zugeordnet wird. Der Band-Band-Ubergang, welcher direkt und erlaubt ist, findet bei etwa 2,7 eV statt. Die Intensitst der Emissionsbanden und die Abklingzeiten werden als Funktion der Temperatur gemessen. Die Ergebnisse werden mit einem ,,detrapping"-und Exzitonenwanderungsmodell interpretiert.

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“…Such experimentally obtained E b values are in well accordance with previous theoretical predicts of CsPbBr 3 QDs, but slightly higher than that of bulk CsPbBr 3 (35 meV), which should be due to quantum confi nement effect. [31][32][33] More importantly, these values are much higher than the thermal disturbance energy at RT (≈26 meV), and than that of GaN (25 meV), which ensures the generation of exitons at RT and their high-rate recombination, and hence induces outstanding PL properties, even stimulated emission at RT [ 12 ] t A t A t A( ) exp exp …”

Section: Mev Exciton Binding Energy and 46 Mev Optical Phononmentioning

confidence: 98%

CsPbX₃ Quantum Dots for Lighting and Displays: Room‐Temperature Synthesis, Photoluminescence Superiorities, Underlying Origins and White Light‐Emitting Diodes

Zhang

et al. 2016

Adv Funct Materials

2,193

105

1,805

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2435wileyonlinelibrary.com IntroductionQuantum dots (QDs), combined with unique optical, electrical properties and solution processed functional applications, have been studied intensively for decades. [ 1,2 ] Recently, Kovalenko and co-workers and Li and co-workers developed CsPbX 3 (X = Cl, Br, I) inorganic perovskite quantum dots (IPQDs), which exhibited ultrahigh photoluminescence (PL) quantum yields (QYs), lowthreshold lasing, and multicolor electroluminescence. However, the usual synthesis needs high temperature, inert gas protection, and localized injection operation, which are severely against applications. Moreover, the so unexpectedly high QYs are very confusing. Here, for the fi rst time, the IPQDs' roomtemperature (RT) synthesis, superior PL, underlying origins and potentials in lighting and displays are reported. The synthesis is designed according to supersaturated recrystallization (SR), which is operated at RT, within few seconds, free from inert gas and injection operation. Although formed at RT, IPQDs' PLs have QYs of 80%, 95%, 70%, and FWHMs of 35, 20, and 18 nm for red, green, and blue emissions. As to the origins, the observed 40 meV exciton binding energy, halogen self-passivation effect, and CsPbX 3 @X quantumwell band alignment are proposed to guarantee the excitons generation and high-rate radiative recombination at RT. Moreover, such superior optical merits endow them with promising potentials in lighting and displays, which are primarily demonstrated by the white light-emitting diodes with tunable color temperature and wide color gamut.

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Cesium-trihalogen-plumbates a new class of ionic semiconductors

Cited by 72 publications

References 5 publications

Extended versus Localized Electronic States in Amorphous TlX and CsPbX3 Films (X = Br, Cl) Studied by Optical Absorption Measurements

Extended versus Localized Electronic States in Amorphous TlX and CsPbX3 Films (X = Br, Cl) Studied by Optical Absorption Measurements

On the Luminescence of Cs₃Bi₂Br₉ Single Crystals

CsPbX₃ Quantum Dots for Lighting and Displays: Room‐Temperature Synthesis, Photoluminescence Superiorities, Underlying Origins and White Light‐Emitting Diodes

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Cesium-trihalogen-plumbates a new class of ionic semiconductors

Cited by 72 publications

References 5 publications

Extended versus Localized Electronic States in Amorphous TlX and CsPbX3 Films (X = Br, Cl) Studied by Optical Absorption Measurements

Extended versus Localized Electronic States in Amorphous TlX and CsPbX3 Films (X = Br, Cl) Studied by Optical Absorption Measurements

On the Luminescence of Cs3Bi2Br9 Single Crystals

CsPbX3 Quantum Dots for Lighting and Displays: Room‐Temperature Synthesis, Photoluminescence Superiorities, Underlying Origins and White Light‐Emitting Diodes

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On the Luminescence of Cs₃Bi₂Br₉ Single Crystals

CsPbX₃ Quantum Dots for Lighting and Displays: Room‐Temperature Synthesis, Photoluminescence Superiorities, Underlying Origins and White Light‐Emitting Diodes