High‐Efficiency and High Color Purity Solution‐Processable Deep‐Blue OLEDs Enabled by Linearly Fully Fused Acceptor‐Donor‐Acceptor Molecular Design DOI

Ying‐Chun Cheng,

Xun Tang, Rajat Walia

и другие.

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 30, 2025

Abstract Solution‐processable organic light‐emitting diodes (OLEDs) have attracted much attention from academia and industry because of their advantages such as low production cost suitability for large‐scale production. However, solution‐processable deep‐blue OLEDs that simultaneously high efficiencies satisfy the BT.2020 standard remain still a great challenge. To address this issue, here tetraboron multiresonance thermally activated delayed fluorescence (MR‐TADF) emitter, tBO‐4B, embedded with two soluble 2,12‐di‐tert‐butyl‐5,9‐dioxa‐13b‐boranaphtho[3,2,1‐de]anthracene groups is designed synthesized linearly fully fused acceptor–donor–acceptor‐type molecular structure. tBO‐4B not only achieves an ultranarrow full width at half maximum 12 nm but also has negligibly small singlet‐triplet energy gap large spin‒orbit coupling, eventually leading to very fast reverse intersystem crossing rate (4.23 × 10 6 s −1 ). The sensitizer‐free solution‐processed OLED exploiting emitter ultrahigh external quantum efficiency (EQE max ) 30.3%, Commission Internationale de l’Éclairage (CIE) coordinates (0.147, 0.042) meeting blue standard. In addition, corresponding vacuum‐processed devices exhibit impressive EQE 39.6% mild roll‐off CIE 0.043). This work will facilitate development high‐efficiency ultrapure MR‐TADF materials solution‐ OLEDs.

Язык: Английский

Strategies for Stabilizing Metal Halide Perovskite Light-Emitting Diodes: Bulk and Surface Reconstruction of Perovskite Nanocrystals DOI
Ye Wu, Desui Chen, Guangruixing Zou

и другие.

ACS Nano, Год журнала: 2025, Номер unknown

Опубликована: Март 7, 2025

Light-emitting colloidal lead halide perovskite nanocrystals (PeNCs) are considered promising candidates for next-generation vivid displays. However, the operational stability of light-emitting diodes (LEDs) based on PeNCs is still lower than those polycrystalline films, which requires an understanding defect formation in PeNCs, both inside crystal lattice ("bulk") and at surface. Meanwhile, uncontrollable ion redistribution electrochemical reactions under LED operation can be severe, also related to bulk surface quality a well-designed device architecture boost carrier injection balance radiative recombination. In this review, we consider reconstruction by enhancing rigidity rationally selecting ligands. Degradation pathways applied voltage discussed, strategies avoid undesirable migration PeNC films. Subsequently, other critical issues hindering commercial application LEDs including toxicity Pb perovskites, scale-up deposition design active-matrix prototypes high-resolution modules.

Язык: Английский

Процитировано

1
Improved vacuum-evaporated blue perovskite light-emitting diodes with phenethylammonium chloride and guanidinium bromide synergistic post-processing modification DOI Creative Commons
Liang Sun,

Xiping He,

Zhiyuan He

и другие.

Frontiers of Optoelectronics, Год журнала: 2025, Номер 18(1)

Опубликована: Март 24, 2025

Abstract Metal halide perovskites have become one of the most competitive new-generation optoelectronic materials due to their excellent properties. Vacuum evaporation can produce high-purity and large-area films, leading wide application this method in semiconductor industry optoelectronics field. However, electroluminescent performance vacuum-evaporated perovskite light-emitting diodes (PeLEDs) still lags behind those counterparts fabricated by solution methods. Herein, based on vacuum evaporation, 3D films are obtained three-source co-evaporation. Considering unique quantum well structure quasi-2D significantly enhance exciton binding energy improve radiative recombination rate, a high photoluminescence yield (PLQY). Subsequently, highly stable low-defect-density is introduced into through post-treatment with phenethylammonium chloride (PEACl). To minimize degradation film quality caused PEACl treatment, layer guanidinium bromide (GABr) evaporated top treatment further emitting layer. Finally, under synergistic post-processing modification GABr, blue PeLEDs maximum external efficiency (EQE) 6.09% brightness 1325 cd/m 2 successfully obtained. This work deepens understanding 2D/3D heterojunctions provides new approach construct performance. Graphical abstract

Язык: Английский

Процитировано

0
Effect of carrier dynamics on mode shift in the ultrafast timescale of perovskite microlasers DOI

Canpu Yang,

Yuheng Liu,

Wenjiang Tan

и другие.

The Journal of Chemical Physics, Год журнала: 2025, Номер 162(19)

Опубликована: Май 16, 2025

In semiconductor-based microlasers, the lasing performance and device properties are closely related to behavior of excited carriers. Comprehending their laser mechanisms controlling on ultrafast timescales is crucial. This paper employs a microscopic optical Kerr-gate method investigate dynamic in composite perovskite micro/nanostructure. The results show that dynamics influenced by bandgap renormalization band-filling (BF) effects. At lower levels pump fluence, energy transfer process has potential impact refractive index, resulting negligible transient mode shift. higher observed extension stimulated radiation lifetime indicates involvement hot carrier cooling emission. mechanism facilitates modulation level occupancy states, stable resonance wavelength during initial few picoseconds. As carriers cool, BF effect can induce notable change leading redshift resonant modes. study offer insights into driven provide promising strategy regulate microcavity at timescale.

Язык: Английский

Процитировано

0
白色发光量子点的荧光可逆开关调控 DOI

张帅 Zhang Shuai,

郗琳 Xi Lin,

栾庆鑫 Luan Qingxin

и другие.

Acta Optica Sinica, Год журнала: 2025, Номер 45(9), С. 0926004 - 0926004

Опубликована: Янв. 1, 2025

Процитировано

0
High‐Efficiency and High Color Purity Solution‐Processable Deep‐Blue OLEDs Enabled by Linearly Fully Fused Acceptor‐Donor‐Acceptor Molecular Design DOI

Ying‐Chun Cheng,

Xun Tang, Rajat Walia

и другие.

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 30, 2025

Abstract Solution‐processable organic light‐emitting diodes (OLEDs) have attracted much attention from academia and industry because of their advantages such as low production cost suitability for large‐scale production. However, solution‐processable deep‐blue OLEDs that simultaneously high efficiencies satisfy the BT.2020 standard remain still a great challenge. To address this issue, here tetraboron multiresonance thermally activated delayed fluorescence (MR‐TADF) emitter, tBO‐4B, embedded with two soluble 2,12‐di‐tert‐butyl‐5,9‐dioxa‐13b‐boranaphtho[3,2,1‐de]anthracene groups is designed synthesized linearly fully fused acceptor–donor–acceptor‐type molecular structure. tBO‐4B not only achieves an ultranarrow full width at half maximum 12 nm but also has negligibly small singlet‐triplet energy gap large spin‒orbit coupling, eventually leading to very fast reverse intersystem crossing rate (4.23 × 10 6 s −1 ). The sensitizer‐free solution‐processed OLED exploiting emitter ultrahigh external quantum efficiency (EQE max ) 30.3%, Commission Internationale de l’Éclairage (CIE) coordinates (0.147, 0.042) meeting blue standard. In addition, corresponding vacuum‐processed devices exhibit impressive EQE 39.6% mild roll‐off CIE 0.043). This work will facilitate development high‐efficiency ultrapure MR‐TADF materials solution‐ OLEDs.

Язык: Английский

Процитировано

0