Enhancing the exciton emission of CsPbCl3 perovskite quantum dots by incorporation of Rb+ ions

Zhao, Zhen-Yu; Xu, Wen; Pan, Gencai; Liu, Yanan; Yang, Miao; Hua, Siwei; Chen, Xu; Peng, Hongshang; Song, Hongwei

doi:10.1016/j.materresbull.2018.12.004

Cited by 44 publications

(30 citation statements)

References 33 publications

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“…Compared to that of Cs‐PeQDs (4.13 ns), the elongated carrier lifetime of (Cs/Rb)‐PeQDs (5.72 ns) implies the remarkable suppression of nonradiative recombination, which is possibly attributed to that of the formation of a strong Rb‐related protective passivation layer on the surface of QDs which can decrease their surface defects (Figure 1b). [ 11,21 ] This is also in good agreement with the improvement of PLQY from 2.2% to 20.4% after Rb doping.…”

Section: Resultssupporting

confidence: 85%

Multiple Cations Enhanced Defect Passivation of Blue Perovskite Quantum Dots Enabling Efficient Light‐Emitting Diodes

Pan

Zhao

Fang

et al. 2020

Advanced Optical Materials

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All inorganic perovskite quantum dots (ABX3, A = Cs, B = Pb, X = Cl, Br, or I) are potential candidates for wide‐color‐gamut display applications. High‐efficiency green and red perovskite quantum dot (PeQD) light‐emitting diodes (LEDs) have been achieved, however, development of blue‐emitting devices, especially those with the relatively short wavelengths (<470 nm) meeting National Television System Committee blue standard, lag largely behind, mainly due to poor film quality, low photoluminescence quantum yield (PLQY) of PeQDs, and unfavorable device structure. Here, a strategy of co‐doping Rb+ and Ni2+ in (Cs0.8Rb0.2)(Pb0.95Ni0.05)(Br1.8Cl1.2) PeQDs is reported to improve the film quality and PLQY of PeQDs by realizing multiple passivations and modifying the energy band of PeQDs to reduce the hole injection barrier. With further engineering the device structure to facilitate the hole transport, PeQDLEDs based on multiple‐cation PeQDs show the maximum EQE of 2.14% and the emission peak at 467 nm with a full width at half maximum of 16 nm. This work would open up a new avenue to design and develop efficient blue‐emitting materials for high‐performance blue PeQDLEDs.

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Section: Resultssupporting

confidence: 85%

Multiple Cations Enhanced Defect Passivation of Blue Perovskite Quantum Dots Enabling Efficient Light‐Emitting Diodes

Pan

Zhao

Fang

et al. 2020

Advanced Optical Materials

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“…For example, Zhao et al . reported the synthesis of Rb y Cs 1−y PbCl 3 (y is the molar concentration of doped Rb + , which is 0 %, 3 %, 9 %, 15 %) perovskite NCs using hot‐injection method . They demonstrated partially substituted Cs + cations for Rb + , which was confirmed by the XRD and X‐ray photoelectron spectroscopy (XPS) (Figure a) measurements.…”

Section: Metal Doping/alloying Of Perovskite Ncsmentioning

confidence: 77%

“…(b–c) TEM images of undoped and doped perovskite NCs, the inset image of a single perovskite NC. Reproduced with permission . copyright © 2018 Elsevier Ltd. (d) XRD pattern of metal doped CsPbCl 3 perovskite NCs with Rb + concentration.…”

Section: Metal Doping/alloying Of Perovskite Ncsmentioning

confidence: 99%

Metal Doping/Alloying of Cesium Lead Halide Perovskite Nanocrystals and their Applications in Light‐Emitting Diodes with Enhanced Efficiency and Stability

Kumawat

Yuan

Bai

et al. 2019

Israel Journal of Chemistry

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Metal halide perovskite nanocrystals (NCs) have demonstrated great advances for light‐emitting diodes (LEDs) applications, owing to their excellent optical, electrical properties and cost‐effective solution‐processing potentials. Tremendous progress has been made in perovskite NCs‐based LEDs during the past several years, with the external quantum efficiency (EQE) boosted to over 20 %. Recently, metal doping/alloying strategy has been explored to finely tune the optoelectronic properties and enhance material stability of perovskite NCs, leading to further improved device efficiency and stability of the obtained perovskite NCs‐based LEDs. In this review, we summarize recent progress on the metal doping/alloying of perovskite NCs and their applications in LEDs. We focus on the effects of different metal doping strategies on the structural and optoelectronic properties of the perovskite NCs. In addition, several works on high‐performance LEDs based on metal doped/alloyed perovskite NCs with different light emission colours are highlighted. Finally, we present an outlook on employing metal doping/alloying strategies to further improve the device efficiency and stability of LEDs based on perovskite NCs.

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“…[75] Alkali metal ions with the same valence and similar ionic radius to Cs + are good alternatives to replace Cs + . The introduction of K + and Rb + into CsPbCl 3 PQDs has been reported, [142,144] and an improved PL QY over 10% at 408 nm was demonstrated. Interestingly, Liu et al found that the K + and lanthanide ions co-doping could further enhance the PL QY, in which the K 0.75 Cs 0.25 PbCl 3 :Eu achieved the highest PL QY up to 31%.…”

Section: Metal-doped Pqdsmentioning

confidence: 97%

Recent Advances in Blue Perovskite Quantum Dots for Light‐Emitting Diodes

Mei²,

Wen

et al. 2021

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Enhancing the exciton emission of CsPbCl3 perovskite quantum dots by incorporation of Rb+ ions

Cited by 44 publications

References 33 publications

Multiple Cations Enhanced Defect Passivation of Blue Perovskite Quantum Dots Enabling Efficient Light‐Emitting Diodes

Multiple Cations Enhanced Defect Passivation of Blue Perovskite Quantum Dots Enabling Efficient Light‐Emitting Diodes

Metal Doping/Alloying of Cesium Lead Halide Perovskite Nanocrystals and their Applications in Light‐Emitting Diodes with Enhanced Efficiency and Stability

Recent Advances in Blue Perovskite Quantum Dots for Light‐Emitting Diodes

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