Enhanced brightness of red light-emitting diodes based on CsPbBr I3-–PEOXA composite films

Kim, Do Hoon; Kim, Yun Cheol; An, Hee Ju; Myoung, Jae Min

doi:10.1016/j.jallcom.2020.156272

Cited by 14 publications

(4 citation statements)

References 41 publications

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“…We found that sky-blue (480-490 nm) emitting devices show significant progress in EQE (>10%) and luminance (>4000 cd m −2 ), but pure blue (455-475 nm) PeLEDs still have a much lower EQE (<6%) and luminance (<1000 cd m −2 ). Mixed halide (Br and Cl) composition and quantum confinement engineering are recognized as effective approaches to obtain [19,37,39,139,156,184,230,[269][270][271][272][273][274][275][276][277][278][279][280][281][282][288][289][290][291][292][293].…”

Section: Pure-blue and Pure-red Peledsmentioning

confidence: 99%

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Electroluminescence Principle and Performance Improvement of Metal Halide Perovskite Light‐Emitting Diodes

Liu

Guo

et al. 2021

Advanced Optical Materials

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Metal halide perovskites have attracted considerable interest for their potential applications in high‐definition displays owing to their narrowband emission, wide color gamut (≈140%), near‐unity photoluminescence efficiency, and cost‐effective solution processability. Extensive efforts have led to the external quantum efficiency of state‐of‐the‐art perovskite light‐emitting diodes (PeLEDs) to exceed 20%. However, there are several obstacles, such as poor working stability, low efficiency, and low luminance, of pure‐blue and pure‐red light‐emitting devices that delay their commercial application. Addressing these issues requires a deep understanding of the photoluminescence effect as well as the bottlenecks in the process. Here, the fundamental working principle, carrier recombination, and light outcoupling properties of PeLEDs are described. The performance improvement strategies of PeLEDs based on defect engineering, perovskite crystallization, charge injection balancing, and quantum confinement are discussed. Furthermore, the challenges of PeLEDs in pure‐color light emission, working stability, and toxicity are reviewed and discussed.

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Section: Pure-blue and Pure-red Peledsmentioning

confidence: 99%

“…c) EQE and d) maximum luminance of pure-red PeLEDs. The data are summarized from references[19,37,39,139,156,184,230,[269][270][271][272][273][274][275][276][277][278][279][280][281][282][288][289][290][291][292][293].…”

mentioning

confidence: 99%

Electroluminescence Principle and Performance Improvement of Metal Halide Perovskite Light‐Emitting Diodes

Liu

Guo

et al. 2021

Advanced Optical Materials

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“…The energy-band levels of ITO, TPBi, and Al/LIF were obtained from the literature, and the energy levels for pristine and 0.2 m CsCl-doped PEDOT:PSS-along with the corresponding perovskite films-were determined via ultraviolet photoelectron spectroscopy (UPS) and Tauc plots. [43][44][45] In the case of the bandgap of the perovskite film fabricated under CsCl 0.2 m condition, two bandgaps (2.63 and 3.81 eV) corresponding to each phase of CsPbBr x Cl 3-x and Cs 4 PbBr x Cl 6-x were observed as shown in Figure S15c (Supporting Information). Since the PeLED with CsCl 0.2 m condition exhibited EL emission at 470 nm corresponding to 2.64 eV, which is very close to the bandgap of CsPbBr x Cl 3-x rather than Cs PbBr x Cl 6-x (3.81 eV), the bandgap of CsPbBr x Cl 3-x was taken into account in the energy-band diagram.…”

Section: Resultsmentioning

confidence: 99%

Highly Efficient Pure‐Blue Perovskite Light‐Emitting Diode Leveraging CsPbBr_xCl₃₋_x/Cs₄PbBr_xCl₆₋_x Nanocomposite Emissive Layer with Shallow Valence Band

Choi

Baek

Takaloo

et al. 2022

Advanced Optical Materials

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Metal‐halide perovskite light‐emitting diodes (PeLEDs) have shown great advancement in green, red, and near‐infrared regions with external quantum efficiencies (EQEs) exceeding 20%. However, blue PeLEDs, an essential part of displays and lightings, show limited progress compared to the other color counterparts. Herein, a highly efficient pure‐blue PeLED is demonstrated by leveraging a novel CsPbBrxCl3‐x/Cs4PbBrxCl6‐x nanocomposite perovskite film as an emissive layer. The Cs4PbBrxCl6‐x phase, the derived phase of CsPbBr3 perovskite with a mixed halide system, effectively passivates defects in CsPbBrxCl3‐x, leading to high luminescence efficiency due to the significant reduction of nonradiative recombination. Furthermore, experimental and computational results confirmed that the compositionally optimized nanocomposite layer possesses a shallower valence band maximum (≈5.5 eV) than the pristine perovskite layer (≈5.9 eV), which is very advantageous in hole injection for device operation. The combined effects of the CsPbBrxCl3‐x/Cs4PbBrxCl6‐x nanocomposite render the fabricated blue PeLED to exhibit a pure‐blue emission at 470 nm with a maximum EQE of 5.3%.

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“…Perovskite light-emitting diodes (PeLEDs) have attracted substantial interest in recent years owing to their unique properties, such as tunable emission wavelength via the control of their composition, high-color-purity light emission with a narrow full width at half maximum (FWHM), solution processability, and compatibility with flexible substrates. [1][2][3] Since the invention of PeLEDs, many researchers have devoted considerable effort into realizing better device performance by improving the quality of perovskite layers as well as optimizing device structures. [4,5] For perovskite-based LEDs, there are two possible recombination processes: direct charge injection and energy transfer followed by Förster resonant energy transfer (FRET).…”

Section: Introductionmentioning

confidence: 99%

Energy and Charge Dual Transfer Engineering for High‐Performance Green Perovskite Light‐Emitting Diodes

Baek

Kim

et al. 2022

Adv Funct Materials

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Perovskite light-emitting diodes (PeLEDs) have garnered considerable interest in recent years owing to their unique optoelectronic properties. However, the performance of PeLEDs is limited by their low quantum efficiency and unbalanced charge injection. In this study, to address these issues, a novel co-hole transport layer (HTL) of 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP) and poly(9-vinylcarbazole) (PVK) is introduced into PeLEDs. By optimizing the composition ratio of CBP and PVK, the performance of CsPbBr 3 -based PeLEDs is significantly improved via efficient Förster resonant energy transfer and an enhanced charge transfer owing to the well-aligned energy levels of the HTLs with the emission layers. The PeLED with an optimized composition ratio of the PVK 0.5 -CBP 0.5 HTL exhibits the best device performance with a luminance of 31641 cd•m −2 , current efficiency of 39.2 cd•A −1 , and external quantum efficiency of 15.4%. Thus, the proposed strategy engineering dual transfer of energy and charge is expected to be revolutionary in the field of PeLED research.

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Enhanced brightness of red light-emitting diodes based on CsPbBr I3-–PEOXA composite films

Cited by 14 publications

References 41 publications

Electroluminescence Principle and Performance Improvement of Metal Halide Perovskite Light‐Emitting Diodes

Electroluminescence Principle and Performance Improvement of Metal Halide Perovskite Light‐Emitting Diodes

Highly Efficient Pure‐Blue Perovskite Light‐Emitting Diode Leveraging CsPbBr_xCl₃₋_x/Cs₄PbBr_xCl₆₋_x Nanocomposite Emissive Layer with Shallow Valence Band

Energy and Charge Dual Transfer Engineering for High‐Performance Green Perovskite Light‐Emitting Diodes

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Enhanced brightness of red light-emitting diodes based on CsPbBr I3-–PEOXA composite films

Cited by 14 publications

References 41 publications

Electroluminescence Principle and Performance Improvement of Metal Halide Perovskite Light‐Emitting Diodes

Electroluminescence Principle and Performance Improvement of Metal Halide Perovskite Light‐Emitting Diodes

Highly Efficient Pure‐Blue Perovskite Light‐Emitting Diode Leveraging CsPbBrxCl3−x/Cs4PbBrxCl6−x Nanocomposite Emissive Layer with Shallow Valence Band

Energy and Charge Dual Transfer Engineering for High‐Performance Green Perovskite Light‐Emitting Diodes

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Product

Resources

About

Highly Efficient Pure‐Blue Perovskite Light‐Emitting Diode Leveraging CsPbBr_xCl₃₋_x/Cs₄PbBr_xCl₆₋_x Nanocomposite Emissive Layer with Shallow Valence Band