In Situ-Fabricated Perovskite Nanocrystals for Deep-Blue Light-Emitting Diodes

Xu, Wenjie; Ji, Ruiqi; Liu, Pinlei; Lü, Cheng; Zhu, Lin; Zhang, Ju; Chen, Hong; Tong, Yunfang; Zhang, Chenglong; Kuang, Zhiyuan; Zhang, Hao; Lai, Jingya; Wen, Kaichuan; Yang, Pinghui; Wang, Nana; Huang, Wei; Wang, Jianpu

doi:10.1021/acs.jpclett.0c03120

Cited by 23 publications

(23 citation statements)

References 38 publications

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“…Similar to the rapid development of NC blue PeLEDs ( Table 2 ), [ 10,11,47,51–55,66,58,59,68,72–77 ] quasi‐2D perovskite blue LEDs have also experienced substantial progress recently ( Table 3 ). Quasi‐2D perovskites have good properties of uniform film morphology, cascade energy transfer, and high quantum efficiency, which will benefit for high‐efficient blue PeLEDs.…”

Section: Blue Peled Performance Improvement Strategiesmentioning

confidence: 96%

“…The NCs showed good optoelectronic properties in preparation of efficient PeLEDs with high brightness and robust durability [46] (details will be discussed in Section 2.2.2). In addition, Wang et al reported an antisolvent treatment assisted in situ formation of perovskite nanocrystals with a facile spin-coating method, in which small Cs x MA 1−x PbBr 3 NCs (≈4.1 nm) with efficient deep-blue emission of 464 nm (PL peak) were achieved by a delay time of the antisolvent treatment [47] (details will be discussed in Section 3.2).…”

Section: Device Working Principlementioning

confidence: 99%

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Strategies Toward Efficient Blue Perovskite Light‐Emitting Diodes

Ren

Wang

Sun

et al. 2021

Adv Funct Materials

107

100

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Substantial progress has been made in blue perovskite light-emitting diodes (PeLEDs). In this review, the strategies for high-performance blue PeLEDs are described, and the main focus is on the optimization of the optical and electrical properties of perovskites. In detail, the fundamental device working principles are first elucidated, followed by a systematical discussion of the key issues for achieving high-quality perovskite nanocrystals (NCs) and quasi-2D perovskites. These involve ligand optimization and metal doping in enhancing the carrier transport and reducing the traps of perovskite NCs, as well as the perovskite phase modulation and defect passivation in improving energy transfer and emission efficiency of quasi-2D perovskites. The strategies for efficient 3D mixed-halide perovskite and lead-free perovskite blue LEDs are then briefly introduced. After that, other strategies, including effective charge transport layer, efficient perovskite emission system, and effective device architecture for high light outcoupling efficiency, are further discussed to boost the blue PeLED performances. Meanwhile, the testing standard of blue PeLED lifetime is suggested to enable the direct comparisons of the device operational stability. Finally, challenges and future directions for blue PeLEDs are addressed.

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Section: Blue Peled Performance Improvement Strategiesmentioning

confidence: 96%

Section: Device Working Principlementioning

confidence: 99%

Strategies Toward Efficient Blue Perovskite Light‐Emitting Diodes

Ren

Wang

Sun

et al. 2021

Adv Funct Materials

107

100

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“…Moreover, the solvent dripping process can modulate the phase distribution of RP perovskites, and uniform phase distribution can partially mitigate spectral instability. [222][223][224]…”

Section: Solvent Engineeringmentioning

confidence: 99%

Ion Migration in Perovskite Light‐Emitting Diodes: Mechanism, Characterizations, and Material and Device Engineering

et al. 2022

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sivation), [18,19] the record EQEs of PeLEDs have reached 12.3%, [20] 28.1%, [21] 23%, [22] and 22.2% [23] for blue, green, red, and infrared emission, respectively. Despite the remarkable progress in improving the performance of PeLEDs, the devices still suffer from poor operational stability and rapid decay over time. Although encapsulation of the devices can protect them against moisture and oxygen, [24] internal heat-or electric field-driven defect generation processes, which are often linked to ion migration, could cause severe degradation of electroluminescence.Ion motion in MHPs was initially observed in perovskite solar cells (PSCs) and manifested as an anomalous dielectric response at low frequency and hysteresis in the current-voltage curve. [25] Extensive studies have been performed to investigate the properties of the ions, [25,26] the ion distribution in PSCs under dark and illumination, [27] and the electronic-ionic coupling and its impact on device operation. [28] PSCs differ from PeLEDs in that the fabrication of PeLEDs typically involves the use of largely excess organic halide salts; a portion of these halides do not participate in the perovskite lattice but instead reside on the surfaces and grain boundaries, thus inducing additional mobile ions in the PeLEDs. [29][30][31] More importantly, the electric field across the very thin perovskite layer (typically tens of nanometers) in a PeLED is much stronger than the field in a PSC. Because of these factors and the effects of local heating, ion migration has a substantial effect on PeLEDs operation. Indeed, numerous recent studies have reported ion-induced degradation of PeLEDs. [31][32][33][34][35][36] Accordingly, many studies on understanding, characterizing, and preventing ion generation and migration in PeLEDs have been performed in the last few years.Herein, we perform a systematic review of the origin, movement mechanism, characterization, effects on device performance and stability, and management of ion migration in PeLEDs. As presented in Scheme 1, the review begins by introducing the origins of ionic defects by considering the structural, compositional, and processing characteristics of perovskite emissive layers. Then, the transport dynamics of ions are described with a focus on three factors: Migration activation energy, external stimulus (e.g., electric field and Joule heating), and pathways (i.e., bulk vs grain boundaries or surfaces). Third, the characterization approaches for probing ion migration in In recent years, perovskite light-emitting diodes (PeLEDs) have emerged as a promising new lighting technology with high external quantum efficiency, color purity, and wavelength tunability, as well as, low-temperature processability. However, the operational stability of PeLEDs is still insufficient for their commercialization. The generation and migration of ionic species in metal halide perovskites has been widely acknowledged as the primary factor causing the performance degradation of PeLEDs. Herein, this topic is systematically d...

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“…Recently, blue perovskite emitters, such as mixed-halide polycrystalline perovskites [11,[15][16][17][18][19], perovskite nanocrystals (NCs) [5,10,[20][21][22][23][24][25][26][27], 2D perovskite nanoplatelets [28][29][30][31][32], and quasi-two-dimensional (quasi-2D) perovskites [33][34][35][36][37][38][39][40][41], have experienced extensive attention for efficient blue PeLEDs. Particularly, there is a booming development for the device efficiencies of quasi-2D perovskites taking the advantages of the energy funneling effect assisted fast exciton transfer and recombination, and the facilely solution-processed perovskite fabrication [42][43][44].…”

Section: Introductionmentioning

confidence: 99%

High-Performance Blue Quasi-2D Perovskite Light-Emitting Diodes via Balanced Carrier Confinement and Transfer

Ren

Sun

et al. 2022

Nano-Micro Lett.

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Extensive investigation of the passivating agents has been performed to suppress the perovskite defects. However, very few attentions have been paid to rationally design the passivating agents for the balance of the carrier confinement and transfer in quasi-2D perovskites, which is essential to achieve high-performance perovskite LEDs (PeLEDs). In this work, tributylphosphine oxide (TBPO) with moderate carbon chain length is demonstrated as a decent passivator for the quasi-2D perovskites by strengthening the carrier confinement for massive radiative recombination within the perovskites, and more importantly providing efficient carrier transfer in the quasi-2D perovskites. Benefiting from these interesting optoelectronic properties of TBPO-incorporated perovskites, we achieve high-efficient blue PeLEDs with an external quantum efficiency up to 11.5% and operational stability as long as 41.1 min without any shift of the electroluminescence spectra. Consequently, this work contributes an effective approach to promote the carrier confinement and transfer for high-performance and stable blue PeLEDs.

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In Situ-Fabricated Perovskite Nanocrystals for Deep-Blue Light-Emitting Diodes

Cited by 23 publications

References 38 publications

Strategies Toward Efficient Blue Perovskite Light‐Emitting Diodes

Strategies Toward Efficient Blue Perovskite Light‐Emitting Diodes

Ion Migration in Perovskite Light‐Emitting Diodes: Mechanism, Characterizations, and Material and Device Engineering

High-Performance Blue Quasi-2D Perovskite Light-Emitting Diodes via Balanced Carrier Confinement and Transfer

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