1
|
Jeon S, Zhao L, Jung YJ, Kim JW, Kim SY, Kang H, Jeong JH, Rand BP, Lee JH. Perovskite Light-Emitting Diodes with Improved Outcoupling Using a High-Index Contrast Nanoarray. Small 2019; 15:e1900135. [PMID: 30701678 DOI: 10.1002/smll.201900135] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Indexed: 05/21/2023]
Abstract
Organic-inorganic hybrid perovskite light-emitting diodes (PeLEDs) are promising for next-generation optoelectronic devices due to their potential to achieve high color purity, efficiency, and brightness. Although the external quantum efficiency (EQE) of PeLEDs has recently surpassed 20%, various strategies are being pursued to increase EQE further and reduce the EQE gap compared to other LED technologies. A key point to further boost EQE of PeLEDs is linked to the high refractive index of the perovskite emissive layer, leading to optical losses of more than 70% of emitted photons. Here, it is demonstrated that a randomly distributed nanohole array with high-index contrast can effectively enhance outcoupling efficiency in PeLEDs. Based on a comprehensive optical analysis on the perovskite thin film and outcoupling structure, it is confirmed that the nanohole array effectively distributes light into the substrate for improved outcoupling, allowing for 1.64 times higher light extraction. As a result, highly efficient red/near-infrared PeLEDs with a peak EQE of 14.6% are demonstrated.
Collapse
Affiliation(s)
- Sohee Jeon
- Nano-Convergence Mechanical Research Division, Korea Institute of Machinery and Materials (KIMM), Yuseong-gu, Daejeon, 34103, Republic of Korea
| | - Lianfeng Zhao
- Department of Electrical Engineering, Princeton University, Princeton, NJ, 08544, USA
| | - Young-Jin Jung
- Department of Materials Science and Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon, 22212, Republic of Korea
| | - Ji Whan Kim
- Samsung Advanced Institute of Technology, Samsung Electronics Co. Ltd., Suwon-si, Gyeonggi-do, 16678, Republic of Korea
| | - Sei-Yong Kim
- LG Chem. Research Park, LG Chem. Co., Ltd., 188 Munji-ro, Yuseong-gu, Daejeon, 34122, Republic of Korea
| | - Hyeokjung Kang
- Nano-Convergence Mechanical Research Division, Korea Institute of Machinery and Materials (KIMM), Yuseong-gu, Daejeon, 34103, Republic of Korea
| | - Jun-Ho Jeong
- Nano-Convergence Mechanical Research Division, Korea Institute of Machinery and Materials (KIMM), Yuseong-gu, Daejeon, 34103, Republic of Korea
| | - Barry P Rand
- Department of Electrical Engineering, Princeton University, Princeton, NJ, 08544, USA
- Andlinger Center for Energy and the Environment, Princeton University, Princeton, NJ, 08544, USA
| | - Jeong-Hwan Lee
- Department of Materials Science and Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon, 22212, Republic of Korea
| |
Collapse
|
2
|
Horie Y, Han S, Lee JY, Kim J, Kim Y, Arbabi A, Shin C, Shi L, Arbabi E, Kamali SM, Lee HS, Hwang S, Faraon A. Visible Wavelength Color Filters Using Dielectric Subwavelength Gratings for Backside-Illuminated CMOS Image Sensor Technologies. Nano Lett 2017; 17:3159-3164. [PMID: 28388090 DOI: 10.1021/acs.nanolett.7b00636] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
We report transmissive color filters based on subwavelength dielectric gratings that can replace conventional dye-based color filters used in backside-illuminated CMOS image sensor (BSI CIS) technologies. The filters are patterned in an 80 nm-thick poly silicon film on a 115 nm-thick SiO2 spacer layer. They are optimized for operating at the primary RGB colors, exhibit peak transmittance of 60-80%, and have an almost insensitive response over a ± 20° angular range. This technology enables shrinking of the pixel sizes down to near a micrometer.
Collapse
Affiliation(s)
- Yu Horie
- T. J. Watson Laboratory of Applied Physics, California Institute of Technology , 1200 East California Boulevard, Pasadena, California 91125, United States
| | - Seunghoon Han
- Samsung Advanced Institute of Technology, Samsung Electronics , Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Jeong-Yub Lee
- Samsung Advanced Institute of Technology, Samsung Electronics , Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Jaekwan Kim
- Samsung Advanced Institute of Technology, Samsung Electronics , Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Yongsung Kim
- Samsung Advanced Institute of Technology, Samsung Electronics , Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Amir Arbabi
- T. J. Watson Laboratory of Applied Physics, California Institute of Technology , 1200 East California Boulevard, Pasadena, California 91125, United States
| | - Changgyun Shin
- Samsung Advanced Institute of Technology, Samsung Electronics , Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Lilong Shi
- Advanced Image Research Lab, Samsung Electronics , 2 North Lake Avenue, Pasadena, California 91101, United States
| | - Ehsan Arbabi
- T. J. Watson Laboratory of Applied Physics, California Institute of Technology , 1200 East California Boulevard, Pasadena, California 91125, United States
| | - Seyedeh Mahsa Kamali
- T. J. Watson Laboratory of Applied Physics, California Institute of Technology , 1200 East California Boulevard, Pasadena, California 91125, United States
| | - Hong-Seok Lee
- Samsung Advanced Institute of Technology, Samsung Electronics , Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Sungwoo Hwang
- Samsung Advanced Institute of Technology, Samsung Electronics , Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
| | - Andrei Faraon
- T. J. Watson Laboratory of Applied Physics, California Institute of Technology , 1200 East California Boulevard, Pasadena, California 91125, United States
| |
Collapse
|