Highly pure yellow light emission of perovskite CsPb(Br I )3 quantum dots and their application for yellow light-emitting diodes

He, Yanbo; Gong, Jinhui; Zhu, Yiyuan; Feng, Xingcan; Peng, Hong Yan; Wang, Wei; He, Haiyang; Liu, Hu; Wang, Li

doi:10.1016/j.optmat.2018.04.009

Cited by 17 publications

(5 citation statements)

References 32 publications

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“…In addition, we noticed that the device performance for the yellow PeLEDs (with an emission wavelength of 550–595 nm) achieved in our work is much higher than the values reported in the literature (Table ). ,,,, …”

Section: Resultsmentioning

confidence: 99%

“…In the past few years, perovskite light-emitting diodes (PeLEDs) have drawn great research interest because of their tunable wavelength, narrower emission bandwidths, and solution processability. − The external quantum efficiency (EQE) of red and green PeLEDs has been boosted from <1% to above 23% using mixed iodine–bromine perovskites , and pure-bromine perovskites, − respectively. The EQE of blue/sky-blue PeLEDs has also reached >10% using mixed bromine–chlorine quasi-two-dimensional (quasi-2D) perovskites. , Theoretically, the emission color can be continuously tuned from red to blue by composition engineering. ,,− However, relatively less research has been done on yellow PeLEDs, despite their role as an important optoelectronic device, mainly including warm-color lighting and as a fog light to reduce traffic accidents, etc. − …”

Section: Introductionmentioning

confidence: 99%

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Stable Yellow Light-Emitting Diodes Based on Quasi-Two-Dimensional Perovskites

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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Perovskite light-emitting diodes (PeLEDs) show great potential in display and lighting because of their tunable wavelength, narrow emission bandwidths, and high color purity. Currently, the external quantum efficiency (EQE) of red and green PeLEDs has reached >23%. However, yellow PeLEDs are still rarely reported because of phase separation in mixed-halide perovskites and the coexistence of multiple phases in quasi-two-dimensional (quasi-2D) perovskites L2A n–1B n X3n+1 (n = 1, 2, 3, ...), where L is a bulky organoammonium ligand. Here, we fabricate stable yellow PeLEDs by manipulating the phase distribution and incorporating rubidium cations (Rb+) in quasi-2D perovskites. The transient absorption results confirm that alkylammonium ligand butyl ammonium (BA) has a narrower phase distribution than phenylethyl ammonium (PEA) in the quasi-2D perovskites, resulting in a more blue-shifted emission peak. We further incorporate a proper molar ratio of Rb+ in the (BA)2CsPb2I7 perovskite to blue-shift the emission peak to the yellow range. Finally, the yellow PeLEDs exhibit an EQE of 3.5%, and the stable emission peak is located at 595 nm. Our work provides a useful approach for the fabrication of highly efficient and stable yellow PeLEDs.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stable Yellow Light-Emitting Diodes Based on Quasi-Two-Dimensional Perovskites

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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“…The conventional methods for preparing all-inorganic perovskites include thermal injection, supersaturated recrystallization, chemical vapor deposition and so on. 22 In the thermal injection method, the growth of perovskite crystals can be controlled by changing the crystal growth direction and changing the concentration of the reactants, which controls the potential energy of monomers in the chemical reaction. [23][24][25][26] The temperature is difficult to control strictly because of the injection of the precursor solution.…”

Section: Introductionmentioning

confidence: 99%

Preparation of perovskite CsPb(Br_xI_1−x)₃quantum dots at room temperature

et al. 2021

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“…That changes the charge neutrality and influences the optical properties. The X-site modulation (halide mixing) is explored [27][28][29] more broadly. Partial replacement of I with Cl or Br significantly enhances the stability of nanoscale perovskite systems by tuning the octahedral factor.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of mechanochemical synthesis of cesium lead halides: pathways toward stabilization of α-CsPbI3

et al. 2020

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Cesium lead iodide with cubic perovskite structure (a-CsPbI 3 ) is gaining significant interest in photovoltaic applications due to its excellent absorbance of the visible solar light and other attractive optoelectronic properties. However, the synthesis of stable a-CsPbI 3 poses a significant challenge. Mechanochemical synthesis is emerging as a suitable method for the preparation of cesium lead halides. This work investigates the ball milling-induced synthesis of cesium lead halides perovskite phase using halide mixing or doping approaches. The synthesis in the CsI ? PbI 2 , CsBr ? PbBr 2 , CsBr ? PbI 2 , and CsI ? PbI 2 ? NdI 3 mixtures and halide exchange reactions in the CsPbBr 3 ? 3KI and CsBr ? PbBr 2 ? 3KI systems are investigated to elucidate the mechanism of this process. Then, CsPb(I 1-x Br x ) 3 and CsPb( 1-y )Nd y I 3 materials with different x and y ratios are prepared, and their stability is probed in the air using light absorption spectroscopy. These results suggest that Nd doping is more efficient in the stabilization of the perovskite structure than partial replacement of iodine with bromine. Microstructure observations reveal the existence of two different product formation mechanisms depending on the mechanical properties of reactants. The results reveal that the milling temperature has a significant impact on the reaction kinetics. The produced particles nucleate and grow at the reactant interface and retard the synthesis reaction by creating a diffusion barrier. Extended milling reduces the product particle size and creates fresh contact between reactants, thus facilitating reaction completion.

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Highly pure yellow light emission of perovskite CsPb(Br I )3 quantum dots and their application for yellow light-emitting diodes

Cited by 17 publications

References 32 publications

Stable Yellow Light-Emitting Diodes Based on Quasi-Two-Dimensional Perovskites

Stable Yellow Light-Emitting Diodes Based on Quasi-Two-Dimensional Perovskites

Preparation of perovskite CsPb(Br_xI_1−x)₃quantum dots at room temperature

Mechanisms of mechanochemical synthesis of cesium lead halides: pathways toward stabilization of α-CsPbI3

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Highly pure yellow light emission of perovskite CsPb(Br I )3 quantum dots and their application for yellow light-emitting diodes

Cited by 17 publications

References 32 publications

Stable Yellow Light-Emitting Diodes Based on Quasi-Two-Dimensional Perovskites

Stable Yellow Light-Emitting Diodes Based on Quasi-Two-Dimensional Perovskites

Preparation of perovskite CsPb(BrxI1−x)3quantum dots at room temperature

Mechanisms of mechanochemical synthesis of cesium lead halides: pathways toward stabilization of α-CsPbI3

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Preparation of perovskite CsPb(Br_xI_1−x)₃quantum dots at room temperature