Organic Hole‐Transport Layers: An Innovative Approach for Efficient Perovskite Light‐Emitting Diodes DOI
Amjad Islam,

Syed Hamad Ullah Shah,

Zeeshan Haider

et al.

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(17)

Published: Feb. 29, 2024

Abstract Organic–inorganic‐halide‐perovskite (OIHP) based light‐emitting diodes (LEDs) are becoming more and well‐described as having multiple potential uses in lighting display technology, owing to their broad color gamut high purity. Recent research reveals that hole‐transport layers (HTLs) perform crucial roles realizing high‐performance highly stable perovskite (PeLEDs). However, the exploration of organic HTLs for obtaining efficient PeLEDs has lagged behind compared electron‐transport layers. In past few years, some innovative have been developed PeLEDs, which demonstrated excellent performances devices. It established HTL/OIHP interface a significant impact on crystallization behaviors electrical properties OIHP film. Herein, different types (polymer/small molecule) used discussed. Also, mechanism action those devices is also presented. Moreover, recent progress blue, green, red PeLED highlighted. Furthermore, strategies improve performance existing standard reviewed. Additionally, challenges present technology briefly summarized. Lastly, viewpoints regarding ongoing obstacles forthcoming prospects emphasized.

Language: Английский

Charge injection engineering at organic/inorganic heterointerfaces for high-efficiency and fast-response perovskite light-emitting diodes DOI Creative Commons
Zhenchao Li, Ziming Chen, Zhangsheng Shi

et al.

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Oct. 13, 2023

The development of advanced perovskite emitters has considerably improved the performance light-emitting diodes (LEDs). However, further LEDs requires ideal device electrical properties, which strongly depend on its interfaces. In with conventional p-i-n structures, hole injection is generally less efficient than electron injection, causing charge imbalance. Furthermore, popular structure NiOx/poly(9-vinylcarbazole) suffers from several issues, such as weak interfacial adhesion, high trap density and mismatched energy levels. this work, we insert a self-assembled monolayer [2-(9H-carbazol-9-yl)ethyl]phosphonic acid between NiOx poly(9-vinylcarbazole) layers to overcome these challenges at organic/inorganic heterointerfaces by establishing robust interface, passivating states aligning We successfully demonstrate blue (emission 493 nm) green 515 devices external quantum efficiencies 14.5% 26.0%, respectively. More importantly, also gives rise much faster response speeds reducing capacitance resistance. Our results pave way for developing more brighter quick response, widening their potential application scope.

Language: Английский

Citations

67
Efficient and Bright Blue Perovskite LEDs Enabled by a Carbazole-Phosphonic Acid Interface DOI
Wentao Xiong, Chen Zou, Weidong Tang

et al.

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(7), P. 2897 - 2903

Published: June 2, 2023

Despite the rapid advances of perovskite light-emitting diodes (PeLEDs), achieving high efficiencies at brightness remains a challenge for blue PeLEDs. Their external quantum (EQEs) luminance settings ≥1000 cd m–2 are unsatisfactory (normally below 10%), limiting scope display applications. Here, we demonstrate (∼478 nm) and sky-blue (∼487 PeLEDs with peak EQEs 10.3 13.6%, respectively, on par or exceeding those state-of-the-art The maximum luminances devices 8136 18 748 m–2, respectively. efficiency enabled by carbazole-phosphonic acid hole-transporting interface emissive layer. interactions between phosphonic uncoordinated Pb2+ critical improving crystallinity suppressing nonradiative losses buried perovskite-charge transporter interface. Our results mark an essential step forward toward

Language: Английский

Citations

58
Boosting External Quantum Efficiency of Blue Perovskite QLEDs Exceeding 23% by Trifluoroacetate Passivation and Mixed Hole Transportation Design DOI

Yingyi Nong,

Jisong Yao, Jiaqi Li

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(27)

Published: April 17, 2024

Abstract Perovskite quantum dot‐based light‐emitting diodes (QLEDs) have been considered a promising display technology due to their wide color gamut for authentic expression. Currently, the external efficiency (EQE) state‐of‐the‐art blue perovskite QLEDs is about 15%, which still lags behind its green and red counterparts (>25%) film‐based LEDs. Here, that achieve an EQE of 23.5% at 490 nm presented, best knowledge, highest value reported among perovskite‐based LED fields. This impressive achieved through combination dot (QD) passivation optimal device design. First, mixed halide CsPbCl 3− x Br QDs passivated by trifluoroacetate exhibit excellent exciton recombination behavior with photoluminescence yield 84% reducing uncoordinated Pb surface defects. Furthermore, designed introducing hole‐transport layer (M‐HTL) increase hole injection transportation capacity improve carrier balance. It further found M‐HTL can decrease leakage radiative in device, evidenced visual electroluminescence spectrum 2.0 V. The work breaks gap 20% significantly promotes commercialization process.

Language: Английский

Citations

58
Highly efficient blue light-emitting diodes based on mixed-halide perovskites with reduced chlorine defects DOI Creative Commons
Yun Gao,

Qiuting Cai,

Yifan He

et al.

Science Advances, Journal Year: 2024, Volume and Issue: 10(29)

Published: July 17, 2024

Perovskite light-emitting diodes (PeLEDs) provide excellent opportunities for low-cost, color-saturated, and large-area displays. However, the performance of blue PeLEDs lags far behind that their green red counterparts. Here, we show external quantum efficiencies (EQEs) scale linearly with photoluminescence yields (PL QYs) CsPb(Br

Language: Английский

Citations

42
Regulating Perovskite Crystallization through Interfacial Engineering Using a Zwitterionic Additive Potassium Sulfamate for Efficient Pure‐Blue Light‐Emitting Diodes DOI
Yi Yu, Bingfeng Wang, Yang Shen

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(7)

Published: Jan. 3, 2024

Quasi-two-dimensional (quasi-2D) perovskites are emerging as efficient emitters in blue perovskite light-emitting diodes (PeLEDs), while the imbalanced crystallization of halide-mixed system limits further improvements device performance. The rapid caused by Cl doping produces massive defects at interface, leading to aggravated non-radiative recombination. Meanwhile, unmanageable is prone facilitate formation nonuniform low-dimensional phases, which results energy loss during exciton transfer process. Here, we propose a multifunctional interface engineering for nucleation and phase regulation incorporating zwitterionic additive potassium sulfamate into hole transport layer. By using ions (K

Language: Английский

Citations

29
High-Performance Blue Perovskite Light-Emitting Diodes Enabled by Synergistic Effect of Additives DOI
Fujun Zhang, Yingguo Yang,

Yanbo Gao

et al.

Nano Letters, Journal Year: 2024, Volume and Issue: 24(4), P. 1268 - 1276

Published: Jan. 19, 2024

While quasi-two-dimensional (quasi-2D) perovskites have good properties of cascade energy transfer, high exciton binding energy, and quantum efficiency, which will benefit high-efficiency blue PeLEDs, inefficient domain distribution management unbalanced carrier transport impede device performance improvement. Herein, (2-(9H-carbazol-9-yl)ethyl)phosphonic acid (2PACz) methyl 2-aminopyridine-4-carboxylate (MAC) were simultaneously introduced to a quasi-2D perovskite film. Relying on the synergistic effect 2PACz MAC, it not only modulates phase inhibiting n = 2 but also greatly improves electrical property As result, as-modified PeLED demonstrated an external efficiency (EQE) 17.08% luminance 10142 cd m–2. This study exemplifies among dual additives offers new effective additive strategy modulating building balanced transport, paves way for fabrication highly efficient PeLEDs.

Language: Английский

Citations

21
Efficient and Stable Red Perovskite Light‐Emitting Diodes via Thermodynamic Crystallization Control DOI

Shi‐Chi Feng,

Yang Shen,

Xin‐Mei Hu

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 2, 2024

Abstract Efficient and stable red perovskite light‐emitting diodes (PeLEDs) demonstrate promising potential in high‐definition displays biomedical applications. Although significant progress has been made device performance, meeting commercial demands remains a challenge the aspects of long‐term stability high external quantum efficiency (EQE). Here, an situ crystallization regulation strategy is developed for optimizing films through ingenious vapor design. Mixed containing dimethyl sulfoxide carbon disulfide (CS 2 ) incorporated to conventional annealing, which contributes thermodynamics dominated well‐aligned cascade phase arrangement. Additionally, surface defect density minimized by CS molecule adsorption. Consequently, target exhibit smooth exciton energy transfer, reduced density, blocked ion migration pathways. Leveraging these advantages, spectrally PeLEDs are obtained featuring emission at 668, 656, 648 nm, yield record peak EQEs 30.08%, 32.14%, 29.04%, along with prolonged half‐lifetimes 47.7, 60.0, 43.7 h initial luminances 140, 250, 270 cd m −2 , respectively. This work provides universal represents stride toward commercialization PeLEDs.

Language: Английский

Citations

21
Self-Stabilized Quasi-2D Perovskite with an Ion-Migration-Inhibition Ligand for Pure Green LEDs DOI
Dezhong Zhang, Chunyu Liu, Jiayun Sun

et al.

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(3), P. 1133 - 1140

Published: Feb. 23, 2024

Perovskite light-emitting diodes (PeLEDs) have recently achieved a great breakthrough in external quantum efficiency (EQE). However, the operational stability of pure primary color PeLEDs lags far behind because serious ion migration. Herein, self-stabilized quasi-2D perovskite is constructed with strategically synthesized ion-migration-inhibition ligand (IMIligand) to realize highly stable and efficient green approaching standard light Rec. 2020. The IMIligand takes role not only eliminate migration pathways anchor halide ions suppress but also further enhance crystalline orientation energy transfer perovskites. Meanwhile, overcomes degradation electrical performance caused by conventional exogenous passivation additives. Ultimately, figure merit at least double that previous works. devices achieve an EQE 26.2% 920 min initial luminance 1000 cd m–2.

Language: Английский

Citations

20
Manipulating solvent fluidic dynamics for large-area perovskite film-formation and white light-emitting diodes DOI Creative Commons
Guangyi Shi,

Zongming Huang,

Ran Qiao

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Feb. 5, 2024

Abstract Presynthesized perovskite quantum dots are very promising for making films with different compositions, as they decouple crystallization and film-formation processes. However, fabricating large-area uniform using is still challenging due to the complex fluidic dynamics of solvents. Here, we report a robust approach an environmental-friendly binary-solvent strategy. Nonbenzene solvents, n-octane n-hexane, mixed manipulate evaporation dot inks, resulting in balanced Marangoni flow, enhanced ink spreadability, solute-redistribution. We can therefore blade-coat compositions same fabrication parameters. White red light-emitting diodes incorporating blade-coated exhibit decent external efficiency 10.6% 15.3% (0.04 cm 2 ), show emission up 28 . This work represents significant step toward application flat panel solid-state lighting.

Language: Английский

Citations

19
High performance and stable pure-blue quasi-2D perovskite light-emitting diodes by multifunctional zwitterionic passivation engineering DOI Creative Commons
Chao Shen,

Shuyan Fang,

Jibin Zhang

et al.

Advanced Photonics, Journal Year: 2024, Volume and Issue: 6(02)

Published: Feb. 26, 2024

Despite the rapid advances of red and green perovskite light-emitting diodes (PeLEDs), achieving high brightness with external quantum efficiency (EQE) remains a challenge for pure-blue PeLEDs, which greatly hinders their practical applications, such as white-light illumination in optical communication high-speed low-loss light source. Herein, we report high-performance PeLED based on mixed-halide quasi-2D perovskites incorporated zwitterionic molecule 3-(benzyldimethylammonio) propanesulfonate (3-BAS). Experimental density functional theory analysis reveals that 3-BAS can simultaneously eliminate non-radiative recombination loss, suppress halide migration, regulate phase distribution smoothing energy transfer perovskites, leading to final photoluminescence yield robust spectrum stability. Thus, recorded 1806 cd m−2 relative higher EQE 9.25% is achieved, successfully demonstrated visible system voice signal transmission. We pave way highly efficient PeLEDs great application potential future networks.

Language: Английский

Citations

17