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Inkjet printing offers a scalable and material-efficient route for fabricating organic light-emitting devices, yet solution-processed phosphorescent OLEDs (PHOLEDs) remain limited by interfacial instability, solvent incompatibility, and poor ambient processability. In this study, we report a high-performance, hole-transport layer (HTL)-free PHOLED fully fabricated under ambient conditions using an inkjet printing strategy based on eco-friendly solvents. A dual self-assembled monolayer (SAM) modification on the ITO anode combining 2,3,4,5,6-pentafluorobenzoyl phosphonic acid and tricosafluorododecanoic acid enables efficient charge injection without the need for conventional HTLs. Complementing this, a binary solvent system comprising environmentally benign components is engineered to suppress the coffee-ring effect and significantly improve film uniformity. Furthermore, a newly designed heteroleptic Ir(III) emitter with tailored solubilizing groups enhances ink compatibility and charge-transport properties. The resulting devices achieve a record-high external quantum efficiency of 16.8% under ambient processing conditions, marking a new benchmark for inkjet-printed PHOLEDs. This work demonstrates a synergistic approach to interfacial engineering and eco-conscious solvent design, offering a scalable, sustainable pathway toward high-efficiency, vacuum-free OLED technologies.In Submission (2025. 08. 19)In Revision (2025. 10. 15)In Accept (2025. 12. 22)https://doi.org/10.1016/j.mattod.2025.12.017

A total of 56 researchers from Jeonbuk National University (President Yang Oh-bong) have been selected for the World s Top 2% Scientists list jointly released by Stanford University and the global publisher Elsevier.This ranking is based on an analysis of approximately 9 million researchers worldwide using standardized citation indicators (C-Score). Among national flagship universities in Korea excluding those affiliated with medical, dental, and hospital systems Jeonbuk National University ranks third in the number of selected researchers.The evaluation was conducted under two criteria: a career-long assessment, which considers overall research achievements from 1960 to 2024, and a single-year assessment, based on research performance in 2024 alone.김남훈(나노융합공학과), 김종훈(수의학과), 이중희(나노융합공학과), 정창규(신소재공학부), 김애란(에너지저장.변환공학과), 한윤봉(화학공학부), 윤영상(화학공학부), 유동진(생명과학과), 김용현(환경공학), 밀란포델(수소에너지융복합기술혁신인재양성사업단), 김정곤(화학과), 트란듀이탄(나노융합공학과), 아민사디아(바이오융합과학과), 정현아(식품영양학과), 강길선(고분자.나노공학과), 알라간 무스라스(유기소재섬유공학과), 유연태(신소재공학부), 채한정(약학과), 피터 팔루카이티스(식물방역학과), 김학용(유기소재섬유공학과), 장점석(생명공학부), 이존화(수의학과), 이재홍(치의학과), 이태희(전자공학부), 쿠마르 디네쉬(기계설계공학부), 김한주(융합기술공학부), 장현민(환경공학), 김형석(전자공학부), 알바로 푸엔테스(전자공학부), 박우현(의학과-생리학), 홍현숙(물리학과), 나석인(유연인쇄전자공학과), 김철생(기계설계공학), 진태영(자원.에너지공학), 박찬희(기계설계공학부-나노바이오기계시스템), 김소리(내과학호흡기학분과), 콜야, 하라단(주거환경학과), 이석재(신소재공학부), 모드샤히르아크탈(에너지-AI융합공학과), Jae-Wook Kang(유연인쇄전자공학과), 손인진(신소재공학부), 조제희(반도체과학기술학과), 장은석(목재응용과학과), 황인호(동물자원과학과), 이승희(고분자.나노공학과), 크리슈나라지(식품공학과), 강춘원(주거환경학과), 정길도(전자공학부), 이동원(고분자.나노공학과), 김동엽(치의학과), 조재혁(소프트웨어공학과), 박준홍(진단검사의학), 윤봉식(환경생명공학), 박상호(화학공학부), 김범석(수의학과)

Sustainable Energy Fuels Recent HOT Articles, 2025(https://pubs.rsc.org/en/journals/articlecollectionlanding?sercode=se themeid=61500ab9-5af2-4b84-a862-07d38ee3d874) AbstractInverted p i n perovskite solar cells (IPSCs) offer promise for next-generation photovoltaics. However, IPSCs utilizing solution-processed PC61BM as the electron transport layer (ETL) remain less interface-optimized than conventional n i p configurations, restricting their efficiency, stability, and scalability. In this work, we introduce an ultrathin atomic-layer-deposited SnOx (ALD-SnOx) film, fabricated at a low temperature (80 C), as a versatile interfacial modifier to address these shortcomings. This scalable, vapor-phase approach directly addresses the core instability in p i n architectures, effectively remedies morphological defects such as pinholes and phase segregation in PC61BM, significantly enhancing interfacial contact and suppressing charge recombination. Consequently, the champion IPSC incorporating a 10 nm ALD-SnOx interlayer yields a power conversion efficiency (PCE) of 19.2%, representing a remarkable 58% improvement over control devices (PCE 11.3%). The ALD-SnOx interlayer effectively enhances moisture resistance, giving the IPSCs excellent environmental stability. Additionally, the redesigned IPSCs show scalability by effectively generating a large-area ( 12.1 cm2) mini-module with a high PCE ( 14.1%). These findings demonstrate the immense potential of this interfacial engineering approach for the commercial production of scalable, stable, and effective IPSCs.DOIhttps://doi.org/10.1039/D5SE01332A

Highlights 3D MSCs were manufactured using a single-flow 3D-DIW printing process. Thickness-capacitance trade-off addressed by novel CAC 3D electrodes. Novel CAC 3D electrode enhances charge adsorption and transport kinetics. 9CAC 3D MSCs achieves Ca of 48.6 mF/cm2 and Ea of 3.25 Wh/cm2. High performance 3D MSCs are suitable for miniaturized energy storage applications.AbstractThree-dimensional (3D) microsupercapacitors (MSCs) are miniaturized energy-storage devices characterized by short charge discharge cycles, high power densities, and low environmental impact. However, their low capacitance remains a critical limitation due to the poor conductivity and limited specific surface area (SSA) of conventional electrode materials. Here, we present a strategy combining 3D printing with advanced interdigitated electrode architectures and plasma surface functionalization to enhance electrochemical performance. Plasma treatment of carbon black (CB)-based 3D MSC electrodes using O₂ + CF₄ gases increased the SSA by 255 % and root-mean-square roughness by 310 %. The formation of surface CO and CF bonds enhanced electrolyte/ion adsorption, yielding an areal capacitance (Cₐ) of 6.73 mF/cm2, significantly higher than that of pristine MSCs (2.11 mF/cm2) at 60 A/cm2. Incorporation of silver current collectors within advanced CB/Ag/CB 3D electrodes further improved Cₐ by 7-fold, achieving 48.6 mF/cm2 and a volumetric capacitance of 5.45 F/cm3, with an energy density of 3.25 Wh/cm2. The flexible 3D MSC module (3 series 3 parallel 3D MSCs) demonstrated excellent mechanical and electrochemical stability, highlighting its potential for wearable electronics and miniaturized Internet-of-Things devices.Graphical abstractThe CAC electrode structure and plasma surface functionalization improve electrode surface properties and provide excellent electrochemical and mechanical stability under harsh environmental conditions and mechanical stress.https://doi.org/10.1016/j.cej.2025.171774

AbstractPerovskite quantum dot light-emitting diodes (PeQLEDs) are promising for display and lighting applications. As the internal quantum efficiency of the state-of-the-art PeQLEDs approaches unity, enhancing photon extraction becomes critical due to severe optical losses. The orientation of transition dipole moments (TDMs) plays a key role in determining the light outcoupling efficiency ( out). Herein, the influence of nanocrystal (NC) shape and stacking behavior on the alignment of TDMs in the emissive layer is investigated. To modulate the TDMs, a facile ligand exchange strategy with bifunctional 1,5-naphthalenedisulfonic acid (NDSA) is introduced, which suppresses surface defects and improves carrier transport efficiency. More importantly, it enhances long-range NC stacking and modifies the dielectric environment of the emissive layer (EML), which increases the fraction of in-plane TDMs from 60% to 70%. This improved orientation is instrumental in out from 16.15% to 20.09%. As a result, devices with NDSA modified exhibit a peak external quantum efficiency (EQE) of 22.63% at 5127 cd m 2 and a maximum luminance of 13 950 cd m 2, significantly outperforming the pristine device. EQE remains above 20% across 400 8000 cd m 2, and device lifetime improves by 400% under ambient conditions with encapsulation.doi.org/10.1002/adma.202517210

Green Solvent Enabled Perovskite Ink for Ambient-Air-Processed Efficient Inkjet-Printed Perovskite Solar CellsVinayak Vitthal Satale, Sagnik Chowdhury, Asmaa Mohamed, Do-Hyung Kim, Sinyoung Cho, Jong-Soo Lee, Jae-Wook KangAbstractPerovskite ink based on a green or non-toxic solvent meets industrial requirements for efficient perovskite solar cells (PSCs). Perovskite inks must be developed with non-toxic or involve the limited use of toxic solvents to fabricate efficient inkjet-printed (IJP) perovskite photovoltaics. Herein, -valerolactone is used as a solvent with a low environmental impact, and the strategy showed category 3 toxicity, even with a small quantity of toxic solvents employed to dissolve the perovskite salts. The structural, optical, and electronic properties of IJP perovskite films are improved by adding 1,3-dimethyl-2-imidazolidinone (DMI) to the green perovskite ink. The IJP perovskite films developed by green solvents with 15% (volume %) of DMI exhibited high thickness uniformity ( 97%), and thicker and smoother surfaces than their counterparts. An additive-modified IJP-PSC device achieved a maximum power conversion efficiency (PCE) of 17.78%, higher than that of an unmodified device (14.75%). The performance of the IJP-PSC device is superior primarily because of its exceptional film-thickness homogeneity, larger grains, and appropriate structures. These attributes significantly decreased unwanted reactions of the perovskite with solvents, ensuring phase purity and enhancing overall efficiency. The innovative green-solvent ink-engineering strategy for producing large-scale perovskite films shows great promise for advancing perovskite solar module technology (with PCE of 13.14%).Published October 1, 2025https://doi.org/10.1002/adfm.202503717

Highly Efficient 3D-Printed PVDF-Based Triboelectric Nanogenerators Featuring Polymorphic Perovskite Nanofillers Nurfatin Hafizah Zain Karimy, Hai Li, Hock Beng Lee, Devi Prashad Ojha, Manoj Mayaji Ovhal, Vasanthan Devaraj, Sooman Lim, Jae-Wook KangAbstractThe realization of optimal performance in polyvinylidene fluoride (PVDF)-based triboelectric nanogenerators (TENGs) is fundamentally linked to the enhancement of the -phase content of PVDF ( -PVDF), which is crucial for improving dielectric properties and surface charge density. Among various strategies, the incorporation of semiconducting perovskite nanofillers has been particularly effective in achieving the desired -PVDF phase for TENG applications. Herein, PVDF dielectric films are embedded with polymorphic formamidinium lead triiodide (FAPbI3) perovskite nanofillers and fabricated using a cost-effective 3D direct-ink writing setup. The phase transformation of FAPbI3 nanofillers within the PVDF matrix, in response to varying annealing temperatures, resulted in the formation of PVDF-FAPbI3( ) and PVDF-FAPbI3( ) composite films, each exhibiting distinct morphology and dielectric characteristics. The incorporation of -FAPbI3 nanofillers rendered the composite film porous and increased the -PVDF content from 45% to 83%. By converting the -FAPbI3 into the -FAPbI3 through post-annealing, the composite film transitioned into a mesoporous structure with enhanced tribo-positive properties. This modification substantially improved the output performance of the TENG, achieving a peak-to-peak voltage (Vp-p) of 392 Vand a power density of 2587 W cm 2. This work highlights the significant impact of perovskite polymorphism on the performance of TENG devices.Published September 25, 2025https://doi.org/10.1002/adfm.202424271

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S. He, W. Zhou, S. Ham, K.-J. Ko, J. Luo, B.-J. Lee, H.B. Lee*, J.-H. Lee* and J.-W. Kang* "High-Performance perovskite quantum dots light-emitting diodes with hole transport layer engineering and synergetic outcoupling enhancement" Applied Surface Science, 680, 161384 (2025)AbstractPerovskite quantum dot light-emitting diodes (PeQLEDs) are frequently considered as the most promising alternatives to organic light-emitting diodes (OLEDs). However, the efficiency of PeQLEDs remains inferior to OLEDs due to suboptimal charge carrier transport and intrinsic light outcoupling efficiency ( out). Herein, a combination of hole transport layer (HTL) engineering and substrate engineering is demonstrated to improve the charge injection and out of PeQLEDs. To replace the conventional PEDOT:PSS, a novel HTL bilayer based on modified PEDOT:PSS and PVK with a lower refractive index and fewer trap densities at the HTL-QDs interface is developed. Additionally, this study identifies the ideal thickness of ITO for achieving optimal out of PeQLEDs through optical simulations and experimental validation. Based on the synergistic use of HTL bilayer and 70-nm-thick ITO, the PeQLEDs achieved an optimal external quantum efficiency of 17.96 % at a luminance of 1763 cd/m 2 and 15.19 % at 8300 cd/m 2 without using any external outcoupling structure, indicating a low efficiency roll-off.https://doi.org/10.1016/j.apsusc.2024.161384