Aligning Transition Dipole Moment toward Light Amplification and Polarized Emission in Hybrid Perovskites

Qin, Jiajun; Zhang, Jia; Shen, Teng; Wang, Heyong; Hu, Bin; Gao, Feng

doi:10.1002/adom.202100984

Cited by 6 publications

(6 citation statements)

References 23 publications

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“…Therefore, using the precursor solution with Pb(CH 3 CO 2 ) 2 ·3H 2 O and MABr will lead to quantum confined nanostructures. More detailed evidence on the coexistence of large and small grains can been found in our previous work. ,, Similar grain size tuning by controlling the stochiometric ratio of MABr has also been reported in Lee’s group . Therefore, our fabrication method enables a very simple nanostructured perovskite film with different band gaps, which offers an ideal condition for searching the underlying optical and electrical physics in multiple band gap nanostructured perovskite LEDs.…”

Section: Resultssupporting

confidence: 81%

“… 2 , 38 , 39 Similar grain size tuning by controlling the stochiometric ratio of MABr has also been reported in Lee’s group. 40 Therefore, our fabrication method enables a very simple nanostructured perovskite film with different band gaps, which offers an ideal condition for searching the underlying optical and electrical physics in multiple band gap nanostructured perovskite LEDs.…”

Section: Resultsmentioning

confidence: 99%

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Revealing Charge Transfer Dynamics in Methylammonium Lead Bromide Perovskites via Transient Photoluminescence Characterization

Zhang

Qin

2022

ACS Appl. Energy Mater.

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It is an important but difficult issue to identify charge and energy transfer processes in materials where multiple band gaps coexist. Conventional methods using transient absorption and optoelectrical characterization based on devices could not provide a clear picture of transfer dynamics. According to the bimolecular and monomolecular nature of each process, the carrier dynamics is supposed to solve this issue. In this work, we established a novel, convenient and universal strategy based on the calculation of carrier dynamics to distinguish energy/charge transfer and reveal their transfer dynamics in methylammonium lead bromide (MAPbBr 3 ) films with mixing wide-band gap small grains and narrow-band gap large grains. A highly efficient charge transfer process is confirmed with a high negative nonradiative bimolecular recombination coefficient of −2.12 × 10 –7 cm –3 s –1 , indicating that free carriers within small grains are efficiently transferred from small grains to large grains. As a result, emission from large grains becomes dominant when increasing the photoexcitation intensity. In addition, current-density-dependent electroluminescence results in emission only from large grains, further verifying the charge transfer process. Moreover, it is interesting to find that when decreasing the size of small grains, the charge transfer process is facilitated, leading to an increased nonradiative bimolecular recombination coefficient from −2.12 × 10 –7 to −4.01 × 10 –7 cm –3 s –1 in large grains. Our work provides a convenient strategy to identify and quantify energy and charge transfer in metal halide perovskites, which can be used to enrich our understanding of perovskite photophysics.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Revealing Charge Transfer Dynamics in Methylammonium Lead Bromide Perovskites via Transient Photoluminescence Characterization

Zhang

Qin

2022

ACS Appl. Energy Mater.

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“…A schematic cross-section of the semipolar 2×2 μLED array with a diameter of 30 μm is shown in Figure 6(a). The semipolar (20)(21) GaN layer was grown on patterned sapphire substrates (PSSs) using an orientationcontrolled epitaxy process. Details of the PSS and bulk GaN epitaxy can be found in our previous research 50 .…”

Section: Polarized Photoluminescence Of Hybrid Nc Stretched Composite...mentioning

confidence: 99%

Self-polarized RGB device realized by semipolar micro-LEDs and perovskite-in-polymer films for backlight applications

Lu,

Lin,

Zhang

et al. 2024

OEA

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In backlighting systems for liquid crystal displays, conventional red, green, and blue (RGB) light sources that lack polarization properties can result in a significant optical loss of up to 50% when passing through a polarizer. To address this inefficiency and optimize energy utilization, this study presents a high-performance device designed for RGB polarized emissions. The device employs an array of semipolar blue μLEDs with inherent polarization capabilities, coupled with mechanically stretched films of green-emitting CsPbBr 3 nanorods and red-emitting CsPbI 3 -Cs 4 PbI 6 hybrid nanocrystals. The CsPbBr 3 nanorods in the polymer film offer intrinsic polarization emission, while the aligned-wire structures formed by the stable CsPbI 3 -Cs 4 PbI 6 hybrid nanocrystals contribute to substantial anisotropic emissions, due to their high dielectric constant. The resulting device achieved RGB polarization degrees of 0.26, 0.48, and 0.38, respectively, and exhibited a broad color gamut, reaching 137.2% of the NTSC standard and 102.5% of the Rec. 2020 standard. When compared to a device utilizing c-plane LEDs for excitation, the current approach increased the intensity of light transmitted through the polarizer by 73.6%. This novel fabrication approach for polarized devices containing RGB components holds considerable promise for advancing next-generation display technologies.

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“…Even more intriguingly, the precise control of dipole direction in perovskite materials can have far-reaching benefits beyond LEDs. It has the potential to enhance other applications, such as amplified spontaneous emission (ASE), opening up new possibilities for advanced photonic devices [172]. In LED applications, the preference lies in having an in-plane dipole orientation, as it aligns with the predominantly vertical propagation of the electromagnetic wave.…”

Section: Statusmentioning

confidence: 99%

Roadmap on perovskite light-emitting diodes

Chen,

Hoye,

Yip

et al. 2024

J. Phys. Photonics

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In recent years, the field of metal-halide perovskite emitters has rapidly emerged as a new community in solid-state lighting. Their exceptional optoelectronic properties have contributed to the rapid rise in external quantum efficiencies (EQEs) in perovskite light-emitting diodes (PeLEDs) from <1% (in 2014) to approaching 30% (in 2023) across a wide range of wavelengths. However, several challenges still hinder their commercialization, including the relatively low EQEs of blue/white devices, limited EQEs in large-area devices, poor device stability, as well as the toxicity of the easily accessible lead components and the solvents used in the synthesis and processing of PeLEDs. This roadmap addresses the current and future challenges in PeLEDs across fundamental and applied research areas, by sharing the community's perspectives. This work will provide the field with practical guidelines to advance PeLED development and facilitate more rapid commercialization.

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Aligning Transition Dipole Moment toward Light Amplification and Polarized Emission in Hybrid Perovskites

Cited by 6 publications

References 23 publications

Revealing Charge Transfer Dynamics in Methylammonium Lead Bromide Perovskites via Transient Photoluminescence Characterization

Revealing Charge Transfer Dynamics in Methylammonium Lead Bromide Perovskites via Transient Photoluminescence Characterization

Self-polarized RGB device realized by semipolar micro-LEDs and perovskite-in-polymer films for backlight applications

Roadmap on perovskite light-emitting diodes

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