Cu doping-enhanced emission efficiency of Mn2+ in cesium lead halide perovskite nanocrystals for efficient white light-emitting diodes

Zheng, Yuzhu; Yuan, Xianglin; Yang, Jian; Li, Qiuyan; Yang, Xinxuan; Yi, Fan; Li, Haibo; Liu, Huilian; Zhao, Jianlong

doi:10.1016/j.jlumin.2020.117586

Cited by 39 publications

(45 citation statements)

References 56 publications

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“…Upon an increase in the Cu 2+ concentration, the excitonic peak shifted toward higher energy (blueshift); such a shift has been explained to be due to a lattice contraction. 17,30,31 However, their effect on the localized electronic structure cannot be predicted solely from this study. In addition, strong absorption could be found below the band gap; this was due to the Urbach tail as commonly observed in lead halide perovskites.…”

Section: Resultsmentioning

confidence: 69%

“…The blueshift of the characteristic peak along with little broadening of the band gap upon Cu 2+ −Mn 2+ codoping reflects a statistical decrease in the size of the NCs (which are in the quantum confinement regime) upon the incorporation of Mn 2+ /Cu 2+ ions in the CsPbCl 3 lattice. 17,24,31 Due to a high extinction coefficient in most of these perovskites (Figure S1c in Supporting Information), it is complex to rule out the existence of impurities solely from optical spectroscopy. 11,17,24,31 Hence, we further proceeded to study the crystal structure of the perovskite NCs by XRD studies (Figure 2a).…”

Section: Resultsmentioning

confidence: 99%

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Defect Passivation of Mn²⁺-Doped CsPbCl₃ Perovskite Nanocrystals as Probed by Scanning Tunneling Spectroscopy: Toward Boosting Emission Efficiencies

Chakraborty

Maiti

Ghorai

et al. 2021

ACS Appl. Nano Mater.

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In recent years, Mn-doped CsPbCl 3 perovskite nanocrystals (NCs) have received widespread attention for solid-state lighting applications. However, a low PL quantum efficiency/yield coupled with a short lifetime of the PL emission forbade the material from further applied advancements. Defect states have been assumed to act as nonradiative recombination sites yielding a truncated PL quantum yield (PLQY). In this direction, simultaneous codoping with transition metals in the host lattice emerged as an effective strategy toward the improvement of PL intensity. However, despite intense research, a complete understanding of this approach remained elusive. Hence, further in-depth studies on the underlying mechanism are essential for their successful use as an optoelectronic material in different devices. In this work, we revisited energy levels of Cu 2+ −Mn 2+ codoped CsPbCl 3 perovskite NCs as a case study. Through scanning tunneling spectroscopy (STS), we observed direct evidence of defect states in the NCs and the microscopic origin of defect passivation upon codoping. The STS studies provided the density of states of the NCs and thereby band-and defect-state energies of the pristine semiconductor; the studies also infer defect passivation of the NCs through doping and codoping processes. The codoped perovskites yielded a high PLQY of 80%, which is one of the highest in the inorganic perovskite to date. This work on perovskite NCs shows the unique advantage of STS measurements over traditional PL studies or decay dynamics toward achieving a complete understanding of defect passivation in the light of their energy levels.

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Section: Resultsmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Defect Passivation of Mn²⁺-Doped CsPbCl₃ Perovskite Nanocrystals as Probed by Scanning Tunneling Spectroscopy: Toward Boosting Emission Efficiencies

Chakraborty

Maiti

Ghorai

et al. 2021

ACS Appl. Nano Mater.

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“…[13] In this context, although PQDs offer a PLQY up to 100% and the color rendering index (CRI) of the PQD mixtures to produce white color can be >80%, the PLQY of the mixture is still far from unity (<70%). [4,14] Clearly, this is an indication that there is a lot of room to improve the white emission. Thus, it is essential to find suitable materials that can provide efficient red, blue, and green (RGB) emission in order to obtain a broadband emission for producing a stable white light.…”

Section: Tunable Carbon-cspbi 3 Quantum Dots For White Ledsmentioning

confidence: 99%

Tunable Carbon–CsPbI₃ Quantum Dots for White LEDs

Rad

Gualdrón‐Reyes

Masi

et al. 2020

Advanced Optical Materials

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In this work, a simple method to prepare white light emissive diodes based on quantum dot (QD) colloidal solutions using mixed carbon QDs (CQDs) and CsPbI3 perovskite (PQDs) is reported. The right combination generates emission across the entire visible spectrum upon ultraviolet excitation. The white light emission of the final films provides high and stable color rendering index of 92%, tuning the chromaticity coordinates of the emission through the applied voltage. By varying the CsPbI3 QD concentration, a mixture is obtained that emits the “warm”, “neutral”, and “cold” white light sought for many indoor lighting applications, or to approximate the visible region of the solar spectrum, respectively. Remarkably, the material syntheses are low cost and truly scalable. In addition, colloidal mixtures of CQDs and CsPbI3 PQDs show a facile deposition for light‐emitting diode (LED) application, showing white electroluminescence, indicating that both kinds of QDs are stable during LED operation. Last but not least, the photoluminescence quantum yield of the colloidal mixtures is higher (up to 75%) than single white emitters, showing itself as a promising system for white emission with tunable properties.

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“…Correspondingly, warm white light-emitting diodes (WLEDs) with a CRI of 85 and luminescence efficacy of 69 lm W −1 were fabricated, with robust stability and high PLQYs even after several purification steps. [103] The temperature dependence of steady-state and time-resolved PL spectra revealed that codoping with Cd 2+ ions significantly decreased the nonradiative defect states and increased the energy transfer rate from the host to Mn 2+ ions. [104] Codoping with different metal ion pairs, such as Ce 3+ /Mn 2+ , Ce 3+ /Eu 3+ , Ce 3+ /Sm 3+ , Bi 3+ /Eu 3+ , Er 3+ /Yb 3+ , Bi 3+ /Mn 2+ , and Bi 3+ /Sm 3+ can also produce a cooperative effect, which provides a new method to obtain additional emissions and broaden the application scope of NCs.…”

Section: Wwwadvopticalmatdementioning

confidence: 93%

Recent Advances in Enhancing and Enriching the Optical Properties of Cl‐Based CsPbX₃ Nanocrystals

Zhu

Wang

et al. 2021

Advanced Optical Materials

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Cu doping-enhanced emission efficiency of Mn2+ in cesium lead halide perovskite nanocrystals for efficient white light-emitting diodes

Cited by 39 publications

References 56 publications

Defect Passivation of Mn²⁺-Doped CsPbCl₃ Perovskite Nanocrystals as Probed by Scanning Tunneling Spectroscopy: Toward Boosting Emission Efficiencies

Defect Passivation of Mn²⁺-Doped CsPbCl₃ Perovskite Nanocrystals as Probed by Scanning Tunneling Spectroscopy: Toward Boosting Emission Efficiencies

Tunable Carbon–CsPbI₃ Quantum Dots for White LEDs

Recent Advances in Enhancing and Enriching the Optical Properties of Cl‐Based CsPbX₃ Nanocrystals

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Cu doping-enhanced emission efficiency of Mn2+ in cesium lead halide perovskite nanocrystals for efficient white light-emitting diodes

Cited by 39 publications

References 56 publications

Defect Passivation of Mn2+-Doped CsPbCl3 Perovskite Nanocrystals as Probed by Scanning Tunneling Spectroscopy: Toward Boosting Emission Efficiencies

Defect Passivation of Mn2+-Doped CsPbCl3 Perovskite Nanocrystals as Probed by Scanning Tunneling Spectroscopy: Toward Boosting Emission Efficiencies

Tunable Carbon–CsPbI3 Quantum Dots for White LEDs

Recent Advances in Enhancing and Enriching the Optical Properties of Cl‐Based CsPbX3 Nanocrystals

Contact Info

Product

Resources

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Defect Passivation of Mn²⁺-Doped CsPbCl₃ Perovskite Nanocrystals as Probed by Scanning Tunneling Spectroscopy: Toward Boosting Emission Efficiencies

Defect Passivation of Mn²⁺-Doped CsPbCl₃ Perovskite Nanocrystals as Probed by Scanning Tunneling Spectroscopy: Toward Boosting Emission Efficiencies

Tunable Carbon–CsPbI₃ Quantum Dots for White LEDs

Recent Advances in Enhancing and Enriching the Optical Properties of Cl‐Based CsPbX₃ Nanocrystals