Highly stable lanthanide-doped CsPbI<sub>3</sub> perovskite nanocrystals with near-unity quantum yield for efficient red light-emitting diodes

Xia, Wenlin; Ren, Zhenwei; Zheng, Zhishuai; Luo, Chengzhao; Li, Jie; Ma, Wenchen; Zhou, Xin; Chen, Yu

doi:10.1039/d2nr06317d

Cited by 13 publications

(5 citation statements)

References 49 publications

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“…Great progress in terms of increasing the luminescence efficiency, stability, and operational characteristics of optoelectronic devices based on CsPbI 3 perovskite nanocrystals was achieved by introduction of Sr 2+ , [9,10] Ni 2+ , [11] Ca 2+ , [12] and Zn 2+ [13] cations. Besides, similar results were achieved through employing heterovalent doping of CsPbI 3 perovskite nanocrystals with smaller Sb 3+ , [14] Yb 3+ , [15] Gd 3+ , [16] or La 3+ [17] cations. At the same time, the B-site doping perovskites with optically active ions such as Mn 2+ , [18,19] Yb 3+ , [20,21] Er 3+ , [22,23] etc.…”

Section: Introductionsupporting

confidence: 63%

B‐Site Doping of Metal Halide Perovskite Nanoplatelets Influences Their Optical Properties

Litvin,

Margaryan,

Yin

et al. 2023

Advanced Optical Materials

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Metal halide perovskite nanoplatelets (NPls) have recently joined a rich family of 2D semiconductor nanomaterials. Quantum and dielectric confinement in these nanostructures endow them with useful optical properties, which include, but are not limited to, high linear and nonlinear absorption coefficients, narrow and tunable emission bands, and high photoluminescence quantum yield. These characteristics render perovskite NPls promising for applications in lighting, photodetection, nonlinear optics, and photocatalysis. Doping is a universal approach for tuning optical and electronic properties of semiconductor materials, and the B‐site doping of perovskite NPls allows the further improvement and adjustment on demand of the above‐mentioned optical properties and may result in the appearance of fundamentally new behavior through embedding optically active dopants. In this mini‐review, the basic knowledge about perovskite NPls is shortly summarized in terms of their colloidal synthesis, and then the B‐site doping of perovskite NPls is considered in terms of the existing approaches (in situ and post‐synthetic doping) and its effect on the optical characteristics (doping with self‐emitting ions such as Mn2+ and rare‐earth elements; consequences for the nonlinear optical response).

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Section: Introductionsupporting

confidence: 63%

B‐Site Doping of Metal Halide Perovskite Nanoplatelets Influences Their Optical Properties

Litvin,

Margaryan,

Yin

et al. 2023

Advanced Optical Materials

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“…The corresponding normalized PL and absorption spectra of YCl3:CsPbI3 NRs showed that peak position exhibited a blue-shift owing to partial substitution of Y 3+ cation [26]. The enlarged bandgap caused the blue-shifts of the absorption and PL spectra for YCl3:CsPbI3 NRs due to the partial substitution of Pb 2+ cation and I − with bigger radius by the smaller Y 3+ and Cl − ions [27]. The photoluminescence quantum yield (PLQY) increased from 51% to 70% for the 0.184 mmol YCl3 passivated CsPbI3 NCs, suggesting enhanced radiative recombination followed by yttrium chloride doping (Figure 4c).…”

Section: Resultsmentioning

confidence: 98%

YCl3-substituted CsPbI3 Perovskite Nanorods for Efficient Red Light-emitting Diodes

Saleem¹,

Katware²,

Amin³

et al. 2023

Preprint

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Cesium lead iodide (CsPbI3) perovskite nanocrystals (NCs) are a promising material for red light-emitting diodes (LEDs) due to their excellent color-purity and high luminous efficiency. However, small-sized CsPbI3 colloidal NCs, such as nanocubes, used in LEDs suffer from confinement effects, negatively impacting their photoluminescence quantum yield (PLQY) and overall efficiency. Here, we introduced YCl3 into the CsPbI3 perovskite, which formed anisotropic, one-dimensional (1D) nanorods. This was achieved by taking advantage of the difference in bond energies between Cl− and I− ions, which caused YCl3 to promote the anisotropic growth of CsPbI3 NCs. The YCl3-based nanorods improved the PLQY and storage stability by passivating the defects reducing the nonradiative recombination rates. When the YCl3-substituted CsPbI3 nanorods are applied to the emissive layer in LEDs, we achieve an external quantum efficiency of ~3.16% which is 1.86-fold higher than the pristine CsPbI3 NCs (1.69%) based LED. Notably, the ratio of horizontal transition dipole moments (TDMs) in the anisotropic YCl3:CsPbI3 nanorods was determined to be 75%, which is higher than the isotropically oriented TDMs in CsPbI3 nanocrystals (67%). This increased TDM ratio led to higher light outcoupling efficiency in nanorods-based LEDs. Overall, the results suggest that YCl3-substituted CsPbI3 nanorods could be promising for achieving high-performance perovskite LEDs.

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“…It is found that the EL spectra for pristine and DDAB‐incorporated PeLEDs slightly shift to higher wavelengths with respect to their PL peaks of 685, 670, 652, and 634 nm, respectively, due to the quantum‐limited Stark effect as reported previously. [ 47 ] The device current density−voltage ( J − V ) curves in Figure 4d show smaller current densities for DDAB‐incorporated PeLEDs than pristine PeLEDs, benefitting from the compact film morphology for suppressed leakage current. Meanwhile, it is found that DDAB‐incorporated PeLEDs have higher brightness than pristine devices at the same current density (below 20 mA cm −2 ) (Figure 4e), indicating that the incorporation of DDAB promotes more efficient radiative recombination.…”

Section: Resultsmentioning

confidence: 99%

In Situ Halide Insertion for Efficient and Stable Pure‐Red Perovskite Light‐Emitting Diodes

Ren

Xia

et al. 2023

Advanced Optical Materials

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Substantial efforts have been made in boosting the performance of perovskite light-emitting diodes (PeLEDs). However, there is still a tough challenge to achieve efficient and stable pure-red PeLEDs with bromide-iodine mixed quasi-two-dimensional (quasi-2D) perovskite due to the unexpected halide migration under device operation. Here, the strategy of in-situ halide insertion is proposed by dynamically treating quasi-2D perovskite film with dodecyl dimethyl ammonium bromide (DDAB), which simultaneously suppresses the vacancy-induced halide migration, inhibits the nonradiative recombination, and enlarges the perovskite bandgap for stable and efficient pure-red emission. Meanwhile, a strong Coulombic force between DDAB and the perovskite is formed, which further anchors the halide for the suppression of halide migration. The merits of DDAB-incorporated perovskites enable over 3-fold enhancement in PeLED external quantum efficiency (EQE) from 2.25 to 8.16%. Furthermore, highly-performed bromide-iodine mixed pure-red PeLEDs have been reported with a CIE coordinate of (0.707, 0.289), closely approaching the display standard Rec. 2020 (0.708, 0.292). More importantly, good operational and spectral stabilities without any shift of the electroluminescence (EL) spectra during operation have also been observed. Consequently, this work provides a feasible and effective approach for efficient and stable pure-red PeLEDs.

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Highly stable lanthanide-doped CsPbI₃ perovskite nanocrystals with near-unity quantum yield for efficient red light-emitting diodes

Abstract: CsPbI3 perovskite nanocrystals (NCs) are rising as promising photoactive materials for optoelectronic devices. However, the poor phase stability of CsPbI3 NCs has set substantial limitations in their practical application. Herein,...

Cited by 13 publications

References 49 publications

B‐Site Doping of Metal Halide Perovskite Nanoplatelets Influences Their Optical Properties

B‐Site Doping of Metal Halide Perovskite Nanoplatelets Influences Their Optical Properties

YCl3-substituted CsPbI3 Perovskite Nanorods for Efficient Red Light-emitting Diodes

In Situ Halide Insertion for Efficient and Stable Pure‐Red Perovskite Light‐Emitting Diodes

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Highly stable lanthanide-doped CsPbI3 perovskite nanocrystals with near-unity quantum yield for efficient red light-emitting diodes

Abstract: CsPbI3 perovskite nanocrystals (NCs) are rising as promising photoactive materials for optoelectronic devices. However, the poor phase stability of CsPbI3 NCs has set substantial limitations in their practical application. Herein,...

Cited by 13 publications

References 49 publications

B‐Site Doping of Metal Halide Perovskite Nanoplatelets Influences Their Optical Properties

B‐Site Doping of Metal Halide Perovskite Nanoplatelets Influences Their Optical Properties

YCl3-substituted CsPbI3 Perovskite Nanorods for Efficient Red Light-emitting Diodes

In Situ Halide Insertion for Efficient and Stable Pure‐Red Perovskite Light‐Emitting Diodes

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Highly stable lanthanide-doped CsPbI₃ perovskite nanocrystals with near-unity quantum yield for efficient red light-emitting diodes