Triplet management for efficient perovskite light-emitting diodes

Qin, Chuanjiang; Matsushima, Toshinori; Potscavage, William J.; Sandanayaka, Atula S. D.; Leyden, Matthew R.; Bencheikh, Fatima; Goushi, Kenichi; Mathevet, Fabrice; Heinrich, Benoît; Yumoto, Go; Kanemitsu, Yoshihiko; Adachi, Chihaya

doi:10.1038/s41566-019-0545-9

Cited by 226 publications

(239 citation statements)

References 38 publications

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“…More importantly, quasi‐2D perovskites possess outstanding semiconducting properties, which in some aspects are on a par with traditional 3D ones . For instance, extraordinary performance have been accomplished in quasi‐2D perovskites based PeLED and photovoltaics . Quasi‐2D perovskite photodetectors also exhibit comparable responsivity and detectivity to their 3D analogues .…”

Section: Introductionsupporting

confidence: 74%

A Chiral Reduced‐Dimension Perovskite for an Efficient Flexible Circularly Polarized Light Photodetector

et al. 2020

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Chiral quasi‐2D perovskite single crystals (SCs) were investigated for their circular polarized light (CPL) detecting capability. Quasi‐2D chiral perovskites, [(R)‐β‐MPA]2MAPb2I7 ((R)‐β‐MPA=(R)‐(+)‐β‐methylphenethylamine, MA=methylammonium), have intrinsic chirality and the capability to distinguish different polarization states of CPL photons. Corresponding quasi‐2D SCs CPL photodetector exhibit excellent detection performance. In particular, our device responsivity is almost one order of magnitude higher than the reported 2D perovskite CPL detectors to date. The crystallization dynamics of the film were modulated to facilitate its carrier transport. Parallel oriented perovskite films with a homogeneous energy landscape is crucial to maximize the carrier collection efficiency. The photodetector also exhibits superior mechanical flexibility and durability, representing a promising candidate for sensitive and robust CPL photodetectors.

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Section: Introductionsupporting

confidence: 74%

A Chiral Reduced‐Dimension Perovskite for an Efficient Flexible Circularly Polarized Light Photodetector

et al. 2020

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“…The maximum luminance and EQE achieved were 37 477 cd m −2 and 14.7%, respectively, for LOD PeLEDs while they were 3664 cd m −2 and 6.8% for ST PeLEDs. Considering the PLQY values (≈70%) and the reported outcoupling efficiency (23%) [ 26 ] of a similar device architecture, the internal quantum efficiencies were calculated at 87.5% for LOD PeLED and 42.2% for ST PeLEDs. One reason for the higher efficiencies from LOD PeLEDs was the reduced formation of shunting paths between the two electrodes, which resulted from the better morphology of LOD films (see atomic force microscope (AFM) images shown in Figure S8 in the Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…This precursor composition is hereafter termed as the large organic‐cation‐doped (LOD) precursor composition. [ 21,26 ] Because of the excess organic cations relative to Pb 2+ , LOD perovskite films should have different properties compared with ST ones. Although both the precursor composition strategies were reported to achieve high performance from quasi‐2D PeLEDs, it is necessary to systematically investigate how the ST and LOD precursor compositions affect the optical and structural properties and LED performance of resulting quasi‐2D perovskite films to avoid confusing interpretation.…”

Section: Introductionmentioning

confidence: 99%

Stoichiometry Control for the Tuning of Grain Passivation and Domain Distribution in Green Quasi‐2D Metal Halide Perovskite Films and Light‐Emitting Diodes

Cheng

Qin

Watanabe

et al. 2020

Adv Funct Materials

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Quasi‐2D metal halide perovskite films are promising for efficient light‐emitting diodes (LEDs), because of their efficient radiative recombination and suppressed trap‐assisted quenching compared with pure 3D perovskites. However, because of the multidomain polycrystalline nature of solution‐processed quasi‐2D perovskite films, the composition engineering always impacts the emitting properties with complicated mechanisms. Here, defect passivation and domain distribution of quasi‐2D perovskite films prepared with various precursor compositions are systematically studied. As a result, in perovskite films prepared from stoichiometric quasi‐2D precursor compositions, large organic ammonium cations function well as passivators. In comparison, precursor compositions of simply adding large organic halide salt into a 3D perovskite precursor ensure not only the defect passivation but also the effective formation of quasi‐2D perovskite domains, avoiding unfavorable appearance of low‐order domains. Quasi‐2D perovskite films fabricated with a well‐designed precursor composition achieve a high photoluminescence quantum yield of 95.3% and an external quantum efficiency of 14.7% in LEDs.

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“…To study the light out‐coupling in PeLED devices, a few groups have reported the simulation methods to calculate the light OCEs. [ 2a,9,16b,18,143 ] For instance, Qin et al. used SETFOS 4.5 software to calculate light out‐coupling, and modeled the excitons with isotropic radiative dipoles.…”

Section: Light Out‐coupling Strategies For Ledsmentioning

confidence: 99%

“…used SETFOS 4.5 software to calculate light out‐coupling, and modeled the excitons with isotropic radiative dipoles. [ 143 ] They also weighed the power radiated from dipole by the PL spectrum from the emission layer. Moreover, they can also calculate the dissipated power with different wavelengths.…”

Section: Light Out‐coupling Strategies For Ledsmentioning

confidence: 99%

Light Out‐Coupling Management in Perovskite LEDs—What Can We Learn from the Past?

Zhang

et al. 2020

Adv Funct Materials

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The research on perovskite light‐emitting diodes (PeLEDs) has experienced an exponential growth in the past six years. The highest external quantum efficiencies (EQEs) have surpassed 20%, 20%, and 10% for red, green, and blue colored LEDs, respectively. Considering the internal quantum efficiency is already approaching unity owing to the high material quality, the limiting factor for further improving the EQE is mainly the poor light out‐coupling efficiencies. Here, by reviewing the progress on the light out‐coupling studies for PeLEDs, organic LEDs (OLEDs), conventional semiconductor LEDs, and other special LEDs, the rational design guidelines are summarized for enhancing PeLED out‐coupling. Briefly, these design guidelines include: 1) introducing nanostructures into the active layer or tuning the thickness of it to couple out the waveguide modes, 2) adding nanostructures between the active layer and transparent electrodes to couple the waveguide modes to substrate modes, 3) adding nanostructures such as nanowires to the glass substrate to couple the substrate mode to air. Essentially, these guidelines indicate that implementing nanophotonic engineering on PeLEDs is a highly promising direction to explore, so as to substantially enhance the device performance.

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Triplet management for efficient perovskite light-emitting diodes

Cited by 226 publications

References 38 publications

A Chiral Reduced‐Dimension Perovskite for an Efficient Flexible Circularly Polarized Light Photodetector

A Chiral Reduced‐Dimension Perovskite for an Efficient Flexible Circularly Polarized Light Photodetector

Stoichiometry Control for the Tuning of Grain Passivation and Domain Distribution in Green Quasi‐2D Metal Halide Perovskite Films and Light‐Emitting Diodes

Light Out‐Coupling Management in Perovskite LEDs—What Can We Learn from the Past?

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