Surface Passivation of Bismuth-Based Perovskite Variant Quantum Dots To Achieve Efficient Blue Emission

Leng, Meiying; Yang, Ying; Chen, Zhengwu; Gao, Wanru; Zhang, Jian; Niu, Guangda; Li, Deng‐Bing; Song, Haisheng; Zhang, Jianbing; Jin, Song; Tang, Jiang

doi:10.1021/acs.nanolett.8b03090

Cited by 169 publications

(203 citation statements)

References 51 publications

Supporting

Mentioning

182

Contrasting

Unclassified

Order By: Relevance

“…The efficiency and stability of halide‐mixed perovskite QDs depends on the ligands. The presence of chlorine causes a large number of defects in perovskite QDs compared to pure bromine analogues . The cation or anion vacancies tend to trap energy between the CB and VB, resulting in a nonradiative recombination process .…”

Section: Component Engineering For Blue‐emissive Perovskitesmentioning

confidence: 99%

“…The lattice distances of the (200) and (003) crystal facets are 3.56 and 3.34 Å, respectively. Although the PLQY of QDs is as low as 12%, with an emission peak at 430 nm, it is improved to 54% at the wavelength of 422 nm through Cl‐passivation . Similar to Pb‐based analogs perovskites, Bi‐based perovskites also exhibit a broad color tunability from 360 to 540 nm by changing the composition of the halide (Br and Cl, in Figure C) …”

Section: Component Engineering For Blue‐emissive Perovskitesmentioning

confidence: 99%

See 1 more Smart Citation

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

Fang

Zhang

Yuan

et al. 2019

InfoMat

View full text Add to dashboard Cite

Perovskite based light‐emitting diodes (PeLEDs) have become a powerful candidate for next‐generation solid‐state lightings and high‐definition displays due to their high photoluminescence quantum yield (PLQY), tunable emission wavelength over the visible spectrum, and narrow emission linewidths. Over the past few years, the development of red‐ and green‐emissive PeLEDs has rapidly increased, and the corresponding external quantum efficiencies (EQE) have exceeded 20%. However, the research progress of blue‐emitting PeLEDs is limited by its poor material quality and inappropriate device structure. Currently, the maximum EQE of blue PeLED is only 6.2%, which is far from the industrialization requirements. In order to promote the development of blue PeLEDs, we summarize the recent research progress of blue perovskite materials and LEDs and discuss several fatal challenges, mainly embodied in low efficiency and poor stability. In order to overcome these challenges, detailed analysis and strategies are put forward in terms of the materials and devices. For the former, we summarize the feasible strategy for the preparation of efficient and stable blue‐emissive perovskites using component engineering. For the latter, we analyze the advantages and limitations of the different strategies for blue‐emissive perovskite in LEDs. At the end of the review, a comprehensive outlook is detailed, including future development directions and several technical problems to be solved. Thus, we aim to highlight the significance and promote the industrialization of PeLEDs.

show abstract

Section: Component Engineering For Blue‐emissive Perovskitesmentioning

confidence: 99%

Section: Component Engineering For Blue‐emissive Perovskitesmentioning

confidence: 99%

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

Fang

Zhang

Yuan

et al. 2019

InfoMat

View full text Add to dashboard Cite

show abstract

“…Since the interlayer connectivity is much more in, a facile charge transport occurs between the other parts of a cell, showing enhanced photovoltaic performances compared to isolated 0D dimer form . New recent reports show that lead‐free perovskites can exhibit photoluminescence quantum yield (PLQY) more than 50% in solution phase, implying potential application in LEDs ,…”

Section: Introductionmentioning

confidence: 99%

Lead‐Free Metal Halide Perovskite Nanocrystals: Challenges, Applications, and Future Aspects

Ghosh

Pradhan

2019

ChemNanoMat

View full text Add to dashboard Cite

Lead halide perovskite materials have shown strong promise in energy harvesting and generation over the past five years. However, their poor ambient stability and lead toxicity issues hinder optoelectronic applications. In the quest for alternatives, metal halide perovskites with lower toxicity and more stable metals have recently emerged. The divalent Pb2+ could be replaced with isoelectronic Sn2+, but Sn2+ tends to oxidize rapidly in presence of air to Sn4+, forming a defect in the structure. However, Sn2+‐based perovskites have been stabilized in 2D structures. Recently Sn4+ based halide perovskites nanocrystals with have been reported with poor luminescence. The replacement of Pb2+ with isoelectronic trivalent elements (Sb3+, Bi3+) results in A3B2X9 type defect‐order perovskite structure, which shows promises for optoelectronic applications. The perovskite nanocrystals of Sb, Bi have been reported in the form of dimers and layered structures. In addition to these, double perovskites, where two divalent Pb2+ are replaced with a monovalent and a trivalent cation have been reported very recently. In this Focus Review, we give a brief summary of different non‐lead perovskite nanocrystals starting from synthesis, characterization, stability, properties to applications, along with potential future directions.

show abstract

“…To further promote the PLQY values, we also investigated the role of surface passivation by introducing oleic acid (OA) as a ligand . As shown in Figure a,b, the PL spectra intensity could be enhanced with the addition of OA content while the emission positions remained unchanged.…”

mentioning

confidence: 99%

Tunable Color Temperatures and Efficient White Emission from Cs₂Ag₁₋_xNa_xIn₁₋_yBi_yCl₆ Double Perovskite Nanocrystals

Niu

Zheng

et al. 2019

Small

Self Cite

119

View full text Add to dashboard Cite

Recently, Bi‐doped Cs2Ag0.6Na0.4InCl6 lead‐free double perovskites demonstrating efficient warm‐white emission have been reported. To enable the solution processing and enrich the application fields of this promising material, here a colloidal synthesis of Cs2Ag1−xNaxIn1−yBiyCl6 nanocrystals is further developed. Different from its bulk states, the emission color temperatures of the nanocrystal can be tuned from 9759.7 to 4429.2 K by Na+ and Bi3+ incorporation. Furthermore, the newly developed nanocrystals can break the wavefunction symmetry of the self‐trapped excitons by partial replacement of Ag+ ions with Na+ ions and consequently allow radiative recombination. Assisted with Bi3+ ions doping and ligand passivation, the photoluminescence quantum yield of the Cs2Ag0.17Na0.83In0.88Bi0.12Cl6 nanocrystals is further promoted to 64%, which is the highest value for lead‐free perovskite nanocrystals at present. The new colloidal nanocrystals with tunable color temperature and efficient photoluminescence are expected to greatly advance the research progress of lead‐free perovskites in single‐emitter‐based white emitting materials and devices.

show abstract

Surface Passivation of Bismuth-Based Perovskite Variant Quantum Dots To Achieve Efficient Blue Emission

Cited by 169 publications

References 51 publications

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

Lead‐Free Metal Halide Perovskite Nanocrystals: Challenges, Applications, and Future Aspects

Tunable Color Temperatures and Efficient White Emission from Cs₂Ag₁₋_xNa_xIn₁₋_yBi_yCl₆ Double Perovskite Nanocrystals

Contact Info

Product

Resources

About

Surface Passivation of Bismuth-Based Perovskite Variant Quantum Dots To Achieve Efficient Blue Emission

Cited by 169 publications

References 51 publications

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

Lead‐Free Metal Halide Perovskite Nanocrystals: Challenges, Applications, and Future Aspects

Tunable Color Temperatures and Efficient White Emission from Cs2Ag1−xNaxIn1−yBiyCl6 Double Perovskite Nanocrystals

Contact Info

Product

Resources

About

Tunable Color Temperatures and Efficient White Emission from Cs₂Ag₁₋_xNa_xIn₁₋_yBi_yCl₆ Double Perovskite Nanocrystals