{"id":668599,"date":"2025-05-12T06:45:28","date_gmt":"2025-05-12T03:45:28","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/novel-material-design-enables-pure-red-perovskite-leds-with-record-breaking-performance\/"},"modified":"2025-05-12T06:45:28","modified_gmt":"2025-05-12T03:45:28","slug":"novel-material-design-enables-pure-red-perovskite-leds-with-record-breaking-performance","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/novel-material-design-enables-pure-red-perovskite-leds-with-record-breaking-performance\/","title":{"rendered":"Novel material design enables pure-red perovskite LEDs with record-breaking performance"},"content":{"rendered":"
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\n Perovskite 3D heterostructure suppresses hole leakage in LEDs. Credit: USTC
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A team from the University of Science<\/a> and Technology<\/a> of China (USTC) of the Chinese Academy of Sciences (CAS) has resolved a critical challenge in pure-red perovskite light-emitting diodes (PeLEDs) by identifying and addressing the root cause of efficiency loss at high brightness.<\/p>\n

Published in Nature<\/i><\/a>, their study introduces a novel material design that enables record-breaking device performance, achieving a peak external quantum efficiency (EQE) of 24.2% and a maximum luminance of 24,600 cd m-2<\/sup>\u2014the brightest pure-red PeLED reported to date.<\/p>\n

Pure-red PeLEDs, crucial for vivid displays and lighting, have long faced a trade-off between efficiency and brightness. While 3D mixed-halide perovskites like CsPbI3-x<\/sub>Brx<\/sub> offer excellent charge transport, their efficiency plummets under high current due to unresolved carrier leakage.<\/p>\n

Using a self-developed diagnostic tool called electrically excited transient absorption (EETA) spectroscopy, the team, led by Prof. Yao Hongbin, Fan Fengjia, Lin Yue, and Hu Wei, captured real-time carrier dynamics in operating devices. They discovered that hole leakage into the electron transport layer\u2014previously undetected due to a lack of in situ characterization methods\u2014was the primary culprit behind efficiency roll-off.<\/p>\n

To tackle this, the researchers engineered a 3D intragrain heterostructure within the perovskite emitter. This design embeds narrow-bandgap light-emitting regions within a continuous [PbX6<\/sub>]4-<\/sup> framework, separated by wide-bandgap barriers that confine carriers.<\/p>\n

Key to the strategy is the molecule p-Toluenesulfonyl-L-arginine (PTLA), which bonds strongly to the perovskite lattice via multiple functional groups (guanidino, carboxyl, amino, and sulfonyl).<\/p>\n

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PTLA expanded the lattice locally, creating wide-bandgap phases without disrupting structural continuity. High-resolution TEM and ultrafast spectroscopy confirmed seamless carrier transfer between the heterostructure’s phases and suppressed hole leakage.<\/p>\n

The optimized PeLEDs exhibited unprecedented performance: at 22,670 cd m-2<\/sup>\u2014nearly 90% of peak brightness\u2014the EQE remained at 10.5%, far surpassing previous records. Stability tests revealed a half-lifetime of 127 hours at 100 cd m-2<\/sup>, with minimal spectral shift during operation.<\/p>\n

The team attributed this success to the heterostructure’s dual role: confining holes to the emitter while maintaining high carrier mobility through an uninterrupted 3D lattice.<\/p>\n

This work bridges a critical gap in perovskite optoelectronics, combining advanced diagnostics with innovative material engineering. Reviewers hailed the study as “a landmark in perovskite LED research,” emphasizing its methodological rigor and transformative results.<\/p>\n

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More information:<\/strong>
\n\t\t\t\t\t\t\t\t\t\t\t\tYong-Hui Song et al, Intragrain 3D perovskite heterostructure for high-performance pure-red perovskite LEDs, Nature<\/i> (2025). DOI: 10.1038\/s41586-025-08867-6<\/a><\/p>\n<\/p><\/div>\n

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\n University of Science and Technology of China
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\n Citation<\/strong>:
\n Novel material design enables pure-red perovskite LEDs with record-breaking performance (2025, May 9)
\n retrieved 11 May 2025
\n from https:\/\/techxplore.com\/news<\/a>\/2025-05-material-enables-pure-red-perovskite.html\n <\/p>\n

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