Tunable photoluminescence of CsPbBr3 perovskite quantum dots for their physical research

Chen, Haitao; Guo, Ao; Zhu, Jun; Cheng, Liwen; Wang, Qiang

doi:10.1016/j.apsusc.2018.08.211

Cited by 58 publications

(34 citation statements)

References 31 publications

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“…It should be noted that the values of t av for CsPbBr 3 and CsPbBr 1.2 I 1.8 NP, embedded in the FAU oxide matrix are significantly higher than that for QD of individual CsPbBr 3 and CsPbBr 1.2 I 1.8 , respectively 5-10 ns [32,41,42] and 27 ns [43]. The t av increase could be associated with the confinement effect on the electronic properties of a semiconductor in the dielectric matrix.…”

Section: Resultsmentioning

confidence: 91%

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Effect of Confinement on Structural and Spectral Characteristics of Composites of CsPbX3 Halide Perovskite Nanoparticles with Zeolites of Faujasite Structure

et al. 2021

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CsPbBr 3-z I z /Y(X) nanocomposites based on FAU (Y and X) zeolites and halide perovskite nanoparticles (HP NP) with CsPbBr 3-z I z composition (z = 0 or 1.8) are prepared. The dependence of HP NP content on the SiO 2 :Al 3 O 2 ratio in the parent zeolite and the formation of composite nanorods regardless of zeolite type in the case of iodine-containing HP due to the directional growth of CsPbBr 1.2 I 1.8 crystals towards the (110) plane are shown. It is found that CsPbBr 3-z I z /Y(X) materials are characterized by a significantly greater lifetime and intensity of photoluminescence in comparison with individual HP due to confinement effect. Highly stable films of CsPbBr 3-z I z /Y(X)@Sil (z = 0 or 1.8) nanocomposites in silicone, which are characterized by a significant reduction of the luminescence band width, which is associated with the effect of silicone polymer on halide-ion exchange in HP, are prepared. It is shown that the color rendering index could be increased up to 95, while the partial index R 9 could be increased up to 99 at correlated color temperature of ~4500 K when using CsPbBr 1.2 I 1.8 /X@Sil in white light emitting diodes.

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Section: Resultsmentioning

confidence: 91%

“…(1) A(t) ~A1 exp(-t/t 1 ) + A 2 exp(-t/t 2 ) + A 3 exp(-t/t 3 ), while the average lifetime of PL (t av ) was calculated according to the equation [32] (2)…”

Section: Methodsmentioning

confidence: 99%

Effect of Confinement on Structural and Spectral Characteristics of Composites of CsPbX3 Halide Perovskite Nanoparticles with Zeolites of Faujasite Structure

et al. 2021

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“…The preparation process of CsPbBr 3 has been introduced in our previous papers [19,20]. To synthesize the CsPbBr 3 / TiO 2 nanocrystals, 15 µL TBOT with 1 mL toluene was added into a 250-mL 3-neck flask containing 20 mL of CsPbBr 3 nanocrystal solution under stirring.…”

Section: Synthesis Of Cspbbr 3 /Tio 2 Nanocrystalsmentioning

confidence: 99%

“…In our previous work, we prepared CsPbX 3 (X = Cl, Br, I) perovskite nanocrystals by the hot-injection method and studied their optical properties [19,20]. By varying the amount of PbX 2 (X = Cl, Br, I), the prepared CsPbX 3 nanocrystals possess high photoluminescence quantum yield (PLQY, about 70%), narrow full width at half-maximum (FWHM) (4-17 nm), tunable band gap (407-680 nm), and highly strong photostability.…”

Section: Introductionmentioning

confidence: 99%

Highly fluorescent CsPbBr3/TiO2 core/shell perovskite nanocrystals with excellent stability

Chen

Guo

et al. 2021

SN Appl. Sci.

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The poor stability of CsPbX3 (X = Cl, Br, I) perovskite nanocrystals is the most impediment to its application in the field of photoelectrics. In this work, monodisperse CsPbBr3/TiO2 nanocrystals are successfully prepared by coating titanium precursor on the surface of colloidal CsPbBr3 nanocrystals at room temperature. The CsPbBr3/TiO2 nanocomposites exhibit excellent stability, remaining the identical particle size (9.2 nm), crystal structures and optical properties. Time-resolved photoluminescence decay shows that the lifetime of CsPbBr3/TiO2 nanocrystals is about 4.04 ns and keeps great stability after lasting two months in the air. Results show that the coating of TiO2 on CsPbBr3 NCs greatly suppressed the anion exchange and photodegradation, which are the main reasons for dramatically improving their chemical stability and photostability. The results provide an effective method to solve the stability problem of perovskite nanostructures and are expected to have a promising application in optoelectronic fieldsArticle highlights 1. Prepared the all-inorganic CsPbBr3/TiO2 core/shell perovskite nanocrystals by an easy method. 2. Explored its essences of PL and lifetime of the synthesized CsPbBr3/TiO2 perovskite nanocrystals. 3. CsPbBr3/TiO2 nanocrystals show the great thermal stability after the post-annealing. 4. The CsPbBr3/TiO2 nanocrystals have a high PLQY and have a promising application in solar cells.

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“…[16] In recent years, an important member of the core-shell QDs emerged, which is the perovskite solar cell. [17][18][19] Organic-inorganic halide perovskite material (CH 3 NH 3 PbX 3 , X = Cl, Br, I) with large optical absorption coefficient and high carrier mobility was considered the most favorable optical gain medium in the development of solar cells. [20] Owing to their extraordinary photoelectric properties, perovskite QDs have drawn enormous attentions in optoelectronic materials studies.…”

Section: Introductionmentioning

confidence: 99%

Overview of Computational Simulations in Quantum Dots

Yang

et al. 2019

Israel Journal of Chemistry

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Quantum dots (QDs) are semiconductor nanocrystals that exhibit exceptional properties not found in their bulk counterparts. They have attracted extensive academic and industrial attentions due to their quantum confinement effects and unique photophysical properties. Computational approaches such as first principles and classical molecular dynamics simulations are indispensable tools in both scientific studies and industrial applications of QDs. In this review, the state‐of‐the‐art progress in computational simulations of optical, electronic and thermal properties of QDs is summarized and discussed. First, the physics of QDs in low dimensional materials are comprehensively reviewed. Then, the theoretical basis and practical applications of two main computational methods are presented. Properties of QDs revealed by computational studies are summarized respectively. Finally, the paper was concluded with comments on future directions in computational modeling of QDs.

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Tunable photoluminescence of CsPbBr3 perovskite quantum dots for their physical research

Cited by 58 publications

References 31 publications

Effect of Confinement on Structural and Spectral Characteristics of Composites of CsPbX3 Halide Perovskite Nanoparticles with Zeolites of Faujasite Structure

Effect of Confinement on Structural and Spectral Characteristics of Composites of CsPbX3 Halide Perovskite Nanoparticles with Zeolites of Faujasite Structure

Highly fluorescent CsPbBr3/TiO2 core/shell perovskite nanocrystals with excellent stability

Overview of Computational Simulations in Quantum Dots

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