https://scholar.dgist.ac.kr/handle/20.500.11750/56884 2026-04-22T11:16:08Z https://scholar.dgist.ac.kr/handle/20.500.11750/60098 Title: MelumiTac: Vision-based Tactile Sensor Using Mechanoluminescence for Dynamic Tactile and Nociceptive Perception Author(s): Bae, Sunggyu; Song, Seongkyu; Jeong, Soon Moon; Park, Kyungseo Abstract: This paper presents MelumiTac, a vision-based tactile (ViTAC) sensor enhanced with mechanoluminescent (ML) materials that emit green light under dynamic tactile stimuli. The integration of an ML elastomer generates self-illumination in response to dynamic tactile stimuli, enabling direct visualization of both dynamic tactile events and nociceptive responses while simultaneously tracking deformation in real-time. Experimental evaluations involving cyclic loading, in-plane motion, and piercing reveal a strong correlation between ML emission, stress rate, and localized deformation, thereby validating its multi-modal tactile sensing capabilities. Additionally, frame-by-frame analysis offers rich insights into the contact dynamics during physical interactions. These improvements, implemented within a small form factor of conventional ViTac sensor, render the approach highly accessible. Thus, we expect that the proposed solution will offer practical and unique advantages to engineers developing and applying vision-based multi-modal tactile sensors. 2025-10-21T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/59237 Title: Mechanoluminescence: Mechanisms, emerging applications, and future prospects Author(s): Hajra, Sugato; Kaja, Kushal Ruthvik; Panda, Swati; Song, Seongkyu; Jeong, Soon Moon; Mishra, Yogendra Kumar; Oh, Tae Hwan; Das, Gobind; Divya, S.; Kim, Hoe Joon Abstract: Mechanoluminescent (ML) materials have gained significant attention in recent years due to their promising applications in force sensing, biomedical diagnostics, structural health monitoring, anti-counterfeiting, lighting, and intelligent artificial skin. These materials are capable of emitting visible light in response to mechanical stimuli such as pressure, tension, or friction, making them ideal candidates for advanced sensing technologies. Their advantages include rapid response time, high durability, and excellent repeatability. This review explores the fundamental mechanisms behind ML emission, including trap-controlled processes, piezoelectric effects, triboelectric phenomena, and molecular packing structures. In addition, recent strategies to enhance ML performance, such as extending afterglow duration, adjusting emission color, increasing luminescence intensity, improving sensitivity, and enabling self-recovery, are discussed. The paper also addresses the development of near-infrared ML materials for expanded applications. Finally, it evaluates the future potential of ML materials in smart systems and outlines key challenges that need to be addressed for their widespread adoption. 2025-11-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/59230 Title: Mechanoluminescent-energy harvesting bimodal sensors for self-powered communication sensors Author(s): Hajra, Sugato; Panda, Swati; Kaja, Kushal Ruthvik; Song, Seongkyu; Ryu, Yeonkyeong; Panigrahi, Basanta Kumar; Vittayakorn, Naratip; Lee, Ju-Hyuck; Jeong, Soon Moon; Kim, Hoe Joon Abstract: Mechanoluminescence (ML) is the emission of light triggered by mechanical stress. In the meantime, accurate, quantitative force measurement is made possible by piezoelectricity, which transforms mechanical deformation into electrical signals. A deep insight into the mechanical interactions, such as strain-based phenomena, is achieved by integrating ML and piezoelectricity into a single device. In this study, a composite based on ZnS:Cu-polydimethylsiloxane (PDMS) is developed to achieve this dual functionality for ML-based optical responses and piezoelectric-based electrical output. The presence of piezoelectricity in PDMS-ZnS:Cu composites was traced using piezo force microscopy (PFM) imaging. Various mechanical stimuli of pressing, stretching, and bending are applied to evaluate the performance of the device. Under a force of 5 N, the piezoelectric nanogenerator (PENG) device generates a voltage of 17 V and a current of 70 nA. Additionally, ML and PENG effects are employed for underwater communications. A signal processing technique is further utilized for the classification of voltage signals produced during underwater communications. This self-powered dual-mode sensor has great potential for use in energy harvesting, wearable technology, and battery-free systems, opening the door to more intelligent and responsive user interfaces. 2025-08-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/58441 Title: FLEXIBLE MULTI-LIGHT-EMITTING BODY AND PREPARATION METHOD THEREOF Author(s): 송성규; 정순문; 조창희; 최현서 Abstract: The present invention relates to a multi-light-emitting body and a preparation method thereof. The multi-light-emitting body according to one embodiment comprises: a first light-emitting layer formed from a mixture of a polymer material and a light-emitting material; an electrode layer formed inside a nanowire area provided on the first light-emitting layer, and having a plurality of first nanowire electrodes and a plurality of second nanowire electrodes which extend in a first direction without overlapping each other; and a second light-emitting layer formed from a mixture on the first light-emitting layer on which the electrode layer is formed.