Bipolar-shell resurfacing for blue LEDs based on strongly confined perovskite quantum dots

Dong, Yitong; Wang, Ya-Kun; Yuan, Fanglong; Johnston, Andrew; Liu, Yuan; Ma, Dávid; Choi, Min; Chen, Bin; Chekini, Mahshid; Baek, Se‐Woong; Sagar, Laxmi Kishore; Fan, James; Hou, Yi; Wu, Mingjian; Lee, Seungjin; Sun, Bin; Hoogland, Sjoerd; Quintero-Bermúdez, Rafael; Ebe, Hinako; Todorovič, P.; Dinic, Filip; Li, Peicheng; Kung, Hao Ting; Saidaminov, Makhsud I.; Kumacheva, Eugenia; Spiecker, Erdmann; Liao, Liang‐Sheng; Voznyy, Oleksandr; Lu, Zheng‐Hong; Sargent, Edward H.

doi:10.1038/s41565-020-0714-5

Cited by 580 publications

(591 citation statements)

References 36 publications

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“…[ 10–12 ] Now, the external quantum efficiency of CsPbBr 3 ‐based light‐emitting diode (LED) has been increased from 0.12% to 22%. [ 7,13 ] However, the perovskite QDs are sensitive to air and humidity, which limits their practical commercial applications. [ 4,14 ] Recently, some strategies were used to enhance the stability of perovskite QDs, such as compositional engineering, [ 15,16 ] surface engineering, [ 17 ] and encapsulation engineering.…”

Section: Figurementioning

confidence: 99%

Transient Optical Properties of CsPbX₃/Poly(maleic anhydride‐alt‐1‐octadecene) Perovskite Quantum Dots for White Light‐Emitting Diodes

Zhu

Chen³

et al. 2020

Physica Rapid Research Ltrs

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Poly(maleic anhydride‐alt‐1‐octadecene) (PMAO)‐coated green CsPbBr3 and red CsPbBr0.6I2.4 quantum dots (QDs), as the phosphor materials for white light‐emitting diodes (WLEDs), are reported. The anhydride groups of PMAO can be bound to the surface ligands of perovskite QDs and act as a protective layer. The results show that CsPbX3/PMAO (X = Cl, Br, I) presents good crystallinity and excellent luminescence properties. Time‐resolved photoluminescence (TRPL) shows that the PL lifetime of CsPbX3/PMAO is prolonged, and the transient absorption (TA) results show that intraband hot‐exciton relaxation and exciton recombination can be slowed down when the CsPbX3 QDs are coated with PMAO. However, the PL quantum yields (PLQYs) increase for both the green‐emitting QDs and the red‐emitting QDs after PMAO coating. WLED devices are fabricated by integrating the green CsPbBr3/PMAO QDs and red CsPbBr0.6I2.4/PMAO QDs on the blue GaN chips. The devices show stable white light emission with Commission Internationale de L'Eclairage (CIE) color coordinates of (0.314, 0.291). The results indicate that CsPbX3/PMAO QDs can be an ideal downconversion fluorescent material for WLED devices.

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Section: Figurementioning

confidence: 99%

Transient Optical Properties of CsPbX₃/Poly(maleic anhydride‐alt‐1‐octadecene) Perovskite Quantum Dots for White Light‐Emitting Diodes

Zhu

Chen³

et al. 2020

Physica Rapid Research Ltrs

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“…Basically, the spectral modulation of perovskite light emitters can be achieved by tuning the composition, size, and/or dimension [25][26][27][28][29] . Blue emissive three-dimensional (3D) perovskite nanocrystals have been successfully fabricated by reducing the size of bulk perovskites or introducing mixed halides [30][31][32][33] . However, the blue EL devices based on such small-sized perovskite nanocrystals suffer from the efficiency and stability issues mainly due to the complicated purification and phase separation 31,34 .…”

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confidence: 99%

Dimension control of in situ fabricated CsPbClBr2 nanocrystal films toward efficient blue light-emitting diodes

et al. 2020

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In the field of perovskite light-emitting diodes (PeLEDs), the performance of blue emissive electroluminescence devices lags behind the other counterparts due to the lack of fabrication methodology. Herein, we demonstrate the in situ fabrication of CsPbClBr2 nanocrystal films by using mixed ligands of 2-phenylethanamine bromide (PEABr) and 3,3-diphenylpropylamine bromide (DPPABr). PEABr dominates the formation of quasi-two-dimensional perovskites with small-n domains, while DPPABr induces the formation of large-n domains. Strong blue emission at 470 nm with a photoluminescence quantum yield up to 60% was obtained by mixing the two ligands due to the formation of a narrower quantum-well width distribution. Based on such films, efficient blue PeLEDs with a maximum external quantum efficiency of 8.8% were achieved at 473 nm. Furthermore, we illustrate that the use of dual-ligand with respective tendency of forming small-n and large-n domains is a versatile strategy to achieve narrow quantum-well width distribution for photoluminescence enhancement.

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“…Under the harsh operational condition, that is, with the bias larger than 6.5 V, distinct colour change is observable even in VAC-treated devices. We emphasize that in this case the current density is over mA cm -2 , which is far above normal working conditions of reported blue PeLEDs 11,14,20,25 . Notably, we observe abnormal plateau-like J-V characteristics during the voltage sweep at 6~6.5 V and severe PL quenching after the operation ( Supplementary Fig.…”

Section: Resultsmentioning

confidence: 60%

“…Unfortunately, even by combining the strategies of mixed bromide/chloride perovskites with the advantages of enhanced quantum-confinement, device performance of spectrally stable blue PeLEDs is still far from practical applications (Supplementary Table 2) 11,14,20,25 .…”

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Mixed Halide Perovskites for High-Efficiency and Spectrally Stable Blue Light-Emitting Diodes

Karlsson¹,

Yi²,

Reichert³

et al. 2020

Preprint

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Bright and efficient blue emission is key to further development of metal halide perovskite light-emitting diodes. Although modifying bromide/chloride composition is straightforward to achieve blue emission, practical implementation of this strategy has been challenging due to poor colour stability and severe photoluminescence quenching. Both detrimental effects become increasingly prominent in perovskites with the high chloride content that is desired to produce blue emission. Here, we solve these critical challenges in mixed halide perovskites and demonstrate spectrally stable blue perovskite light-emitting diodes (PeLEDs) over a wide range of emission wavelengths from 490 to 451 nanometres. The emission colour is directly tuned by modifying the halide composition. Particularly, our blue and deep-blue PeLEDs based on three-dimensional perovskites show high EQE values of 11.0% and 5.5% with emission peaks at 477 and 467 nm, respectively. These achievements are enabled by a vapour-assisted crystallization technique, which largely mitigates local compositional heterogeneity and ion migration.

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Bipolar-shell resurfacing for blue LEDs based on strongly confined perovskite quantum dots

Cited by 580 publications

References 36 publications

Transient Optical Properties of CsPbX₃/Poly(maleic anhydride‐alt‐1‐octadecene) Perovskite Quantum Dots for White Light‐Emitting Diodes

Transient Optical Properties of CsPbX₃/Poly(maleic anhydride‐alt‐1‐octadecene) Perovskite Quantum Dots for White Light‐Emitting Diodes

Dimension control of in situ fabricated CsPbClBr2 nanocrystal films toward efficient blue light-emitting diodes

Mixed Halide Perovskites for High-Efficiency and Spectrally Stable Blue Light-Emitting Diodes

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Bipolar-shell resurfacing for blue LEDs based on strongly confined perovskite quantum dots

Cited by 580 publications

References 36 publications

Transient Optical Properties of CsPbX3/Poly(maleic anhydride‐alt‐1‐octadecene) Perovskite Quantum Dots for White Light‐Emitting Diodes

Transient Optical Properties of CsPbX3/Poly(maleic anhydride‐alt‐1‐octadecene) Perovskite Quantum Dots for White Light‐Emitting Diodes

Dimension control of in situ fabricated CsPbClBr2 nanocrystal films toward efficient blue light-emitting diodes

Mixed Halide Perovskites for High-Efficiency and Spectrally Stable Blue Light-Emitting Diodes

Contact Info

Product

Resources

About

Transient Optical Properties of CsPbX₃/Poly(maleic anhydride‐alt‐1‐octadecene) Perovskite Quantum Dots for White Light‐Emitting Diodes

Transient Optical Properties of CsPbX₃/Poly(maleic anhydride‐alt‐1‐octadecene) Perovskite Quantum Dots for White Light‐Emitting Diodes