| 학회 | 한국재료학회 |
| 학술대회 | 2016년 가을 (11/16 ~ 11/18, 경주 현대호텔) |
| 권호 | 22권 2호 |
| 발표분야 | F. 광기능/디스플레이 재료 분과 |
| 제목 | Flexible vertical inorganic light-emitting diodes for biomedical applications |
| 초록 | The fabrication of light sources on flexible substrates has attracted a great interest for future display system and biomedical applications. Inorganic light-emitting diodes (ILEDs) have superior advantages in long-term stability, high efficiency, strong brightness and possibility of waterproof. With these advantages, ILEDs have expanded its applications to consumer electronics such as energy efficient light lamp, back-light unit of displays. However, ILEDs cannot be made directly on flexible substrate because efficient ILEDs need rigid, robust, and flat substrate for epitaxial growth. This problem can be handled by standard micro-fabrication and soft lithography techniques in which the thin film on bulk substrate followed by high temperature annealing and then transferred onto flexible substrates. Since the first invention of flexible III-V materials in 2005, Rogers’ group has presented flexible inorganic LEDs by using micro-structured GaAs/GaN. Recently in 2011, Lee et al. established the flexible waterproof InGaN ILED on a liquid crystal polymer substrate for biomedical application by using micro-structure transferring process. Although this work proposed the feasibility for flexible LED and its application to biosensor, the realization of more efficient ILEDs is crucial for various biomedical applications which require both higher optical power and lower temperature during operation. Herein, we demonstrated the noble strategies for fabrication of flexible vertical structure LEDs (f-VLEDs). Thin layers of LEDs were detached from sapphire or GaAs mother substrate using wet etching or universal soft lithographic transferring protocol. Anisotropic conductive film facilitates vertical interconnection between LED chips and metal lines. Due to the advantage of high quality LED properties originally grown on mother substrate, high brightness flexible ILEDs have made. f-VLEDs will provide the opportunities for the promising future flexible displays and biomedical devices. |
| 저자 | 이승현, 이한얼, 신정호, 이건재 |
| 소속 | KAIST |
| 키워드 | Flexible; Biomedical; III-V; vertical |
