Ligand-engineered bandgap stability in mixed-halide perovskite LEDs

Hassan, Yasser; Park, Jong Hyun; Crawford, Michael L.; Sadhanala, Aditya; Lee, Jeong-Jae; Sadighian, James C.; Mosconi, Edoardo; Shivanna, Ravichandran; Radicchi, Eros; Jeong, Mingyu; Yang, Changduk; Choi, Hyosung; Park, Sung Heum; Song, Myoung Hoon; Angelis, Filippo De; Wong, C.; Friend, Richard H.; Lee, Bo Ram; Snaith, Henry J.

doi:10.1038/s41586-021-03217-8

Cited by 590 publications

(624 citation statements)

References 55 publications

(67 reference statements)

Supporting

Mentioning

580

Contrasting

Unclassified

Order By: Relevance

“…The EQE remains at 21 % when the luminance reaches 100 cd m −2 : the EQE at 100 cd m −2 is 1.4× higher than that of the best previously‐reported red perovskite LEDs (EQE of 14.6 at 100 cd m −2 ) (Figure 4 b and Figure s12) [31] . These LEDs also exhibit a record‐low turn‐on voltage (2.0 V), which is ≈0.06 V higher than the optical band gap; and they exhibit the lowest driving voltage required to reach 1000 cd m −2 among all reported red perovskite LEDs—this is fully 2.5× lower than previous record devices at the same luminescence (1000 cd m −2 ) [8, 17, 22, 23, 31, 47–55] (Figure 4 a). We optimized the QD size to approach the Rec.…”

Section: Resultsmentioning

confidence: 80%

“…Compared to previous record‐EQE red perovskite LEDs (EQE=21.3 % with a T50 of 0.08 hour), [31] the devices in the present work show both a higher EQE of 23 %, and a 100‐fold longer T50 at a 2‐fold higher luminance (Table s1). The high EQE together with the stability represent the best among red perovskite LEDs approaching pure‐red emission with EL <660 nm [31, 37, 55] …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

All‐Inorganic Quantum‐Dot LEDs Based on a Phase‐Stabilized α‐CsPbI₃ Perovskite

et al. 2021

View full text Add to dashboard Cite

The all‐inorganic nature of CsPbI3 perovskites allows to enhance stability in perovskite devices. Research efforts have led to improved stability of the black phase in CsPbI3 films; however, these strategies—including strain and doping—are based on organic‐ligand‐capped perovskites, which prevent perovskites from forming the close‐packed quantum dot (QD) solids necessary to achieve high charge and thermal transport. We developed an inorganic ligand exchange that leads to CsPbI3 QD films with superior phase stability and increased thermal transport. The atomic‐ligand‐exchanged QD films, once mechanically coupled, exhibit improved phase stability, and we link this to distributing strain across the film. Operando measurements of the temperature of the LEDs indicate that KI‐exchanged QD films exhibit increased thermal transport compared to controls that rely on organic ligands. The LEDs exhibit a maximum EQE of 23 % with an electroluminescence emission centered at 640 nm (FWHM: ≈31 nm). These red LEDs provide an operating half‐lifetime of 10 h (luminance of 200 cd m−2) and an operating stability that is 6× higher than that of control devices.

show abstract

Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

All‐Inorganic Quantum‐Dot LEDs Based on a Phase‐Stabilized α‐CsPbI₃ Perovskite

et al. 2021

View full text Add to dashboard Cite

show abstract

“…3e), which to our knowledge, represents the highest external quantum efficiency ever reported in solutionprocessed QD LEDs based on all semiconductor materials. 4,7-9, [52][53][54][55][56][57][58] In another device, the peak ηCE and power efficiency, ηPE, reach 107.5 cd A -1 and 112.5 lm W -1 (Supplementary Fig. 13), respectively, comparable to the state-of-the-art OLEDs.…”

Section: Pl (-)mentioning

confidence: 76%

Two-Dimensional Nanoplatelet Superlattices Overcoming Light Outcoupling Efficiency Limit in Perovskite Quantum Dot Light-Emitting Diodes

Kumar

Marcato

Krumeich³

et al. 2021

Preprint

View full text Add to dashboard Cite

Quantum dot (QD) light-emitting diodes (LEDs) are emerging as one of the most promising candidates for next-generation displays. However, their intrinsic light outcoupling efficiency remains considerably lower than the organic counterpart, because it is not yet possible to control the transition-dipole-moment (TDM) orientation in QD solids at device level. Here, using the colloidal lead halide perovskite nanoplatelets (NPLs) as a model system, we report a directed self-assembly approach to form the two-dimensional superlattices (2DSLs) with the out-of-plane vector perpendicular to the substrate plane. The ligand and substrate engineering yields close-packed planar arrays with the side faces linked to each other. Emission polarization in individual NPLs rescales the radiation from horizontal and vertical transition dipoles, effectively resulting in preferentially horizontal TDM orientation. Based on the emissive thin films comprised of stacks of 2D superlattices, we demonstrate an enhanced ratio of horizontal dipole as revealed by 2D k-space spectroscopy. Our optimized single-junction QD LEDs showed peak external quantum efficiency of up to 24% and power efficiency exceeding 110 lm W-1, comparable to state-of-the-art organic LEDs.

show abstract

“…Hybrid organic‐inorganic perovskites (HOIPs), with chemical formula ABX 3 , have been extensively studied in the past decade due to their remarkable optoelectronic properties such as long carrier diffusion lengths, [1] long carrier lifetimes [2] and large absorption coefficients, [3] and potential applications in solar cells, [4,5] light‐emitting diodes (LEDs), [6,7] photodetectors [8–10] and X‐ray detectors [11–13] . Among all kinds of HOIPs, the methylammonium lead iodide (MAPbI 3 ) was the first one to be reported with photovoltaic effects [4] .…”

Section: Introductionmentioning

confidence: 99%

Ternary Hybrid Perovskite Solid Solution Single Crystals: Growth, Composition Determination and Phase Stability in Highly Moist Atmosphere

Tao

Gao

Yan

2021

Chemistry A European J

View full text Add to dashboard Cite

Ternary hybrid perovskite solid solutions have shown superior optoelectronic properties and better stability than their ABX3 simple perovskite counterparts under ambient conditions. However, crystal growth and identification of the accurate composition of these complex crystalline compounds remain challenging, and their stability under extreme conditions such as in highly moist atmosphere is unknown. Herein, large‐size (up to 2 cm) single crystals of ternary perovskite 0.80FAPbI3 ⋅ x′FAPbBr3 ⋅ y′CsPbI3 (x′+y′=0.20) are grown. An elemental analysis method based on wavelength dispersive X‐ray fluorescence is proposed to determine their accurate compositions. Among these single crystals, the composition with y′=0.12 shows the best moisture stability at 90 % relative humidity for 15 days. Other components with richer or poorer Cs+ ions undergo different phase segregation behaviours. The performance and stability of photodetectors based on these single crystals are tested. This work offers a deeper insight into phase stability of ternary hybrid perovskite solid solution crystals in highly moist atmosphere.

show abstract

Ligand-engineered bandgap stability in mixed-halide perovskite LEDs

Cited by 590 publications

References 55 publications

All‐Inorganic Quantum‐Dot LEDs Based on a Phase‐Stabilized α‐CsPbI₃ Perovskite

All‐Inorganic Quantum‐Dot LEDs Based on a Phase‐Stabilized α‐CsPbI₃ Perovskite

Two-Dimensional Nanoplatelet Superlattices Overcoming Light Outcoupling Efficiency Limit in Perovskite Quantum Dot Light-Emitting Diodes

Ternary Hybrid Perovskite Solid Solution Single Crystals: Growth, Composition Determination and Phase Stability in Highly Moist Atmosphere

Contact Info

Product

Resources

About

Ligand-engineered bandgap stability in mixed-halide perovskite LEDs

Cited by 590 publications

References 55 publications

All‐Inorganic Quantum‐Dot LEDs Based on a Phase‐Stabilized α‐CsPbI3 Perovskite

All‐Inorganic Quantum‐Dot LEDs Based on a Phase‐Stabilized α‐CsPbI3 Perovskite

Two-Dimensional Nanoplatelet Superlattices Overcoming Light Outcoupling Efficiency Limit in Perovskite Quantum Dot Light-Emitting Diodes

Ternary Hybrid Perovskite Solid Solution Single Crystals: Growth, Composition Determination and Phase Stability in Highly Moist Atmosphere

Contact Info

Product

Resources

About

All‐Inorganic Quantum‐Dot LEDs Based on a Phase‐Stabilized α‐CsPbI₃ Perovskite

All‐Inorganic Quantum‐Dot LEDs Based on a Phase‐Stabilized α‐CsPbI₃ Perovskite