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26 results on '"Wu, Ting-Zhu"'

3. Enhancing the Efficiency of Green micro-LEDs by Optimizing p-Electrode Contact Area Ratios

Author

Guo, Wen-An, Liu, Shi-Biao, Lu, Ting-Wei, Lin, Mai-Jia, Lai, Shou-Qiang, Su, Yu-Han, Lu, Yi-Jun, Kuo, Hao-Chung, Chen, Zhong, and Wu, Ting-Zhu

Abstract

Considering the low electrical conductivity of the p-type contact layer, current crowding is the primary impediment to the preparation of gallium nitride green micro-light-emitting-diodes (micro-LEDs). In this study, the effects of different p-electrode contact area ratios on the photoelectric characteristics of green micro-LEDs were investigated. We demonstrated that appropriately increasing the p-electrode contact area ratio improves the photoelectric performance of green micro-LEDs, including the dynamic resistance, electroluminescence (EL) intensity, light output power (LOP), wall-plug efficiency (WPE), and external quantum efficiency. Microscopic hyperspectral imaging ( $\mu $ -HSI) revealed that optimizing the p-electrode contact area ratio promotes current spreading and improves the uniformity of luminous distribution on chip surfaces. The Comsol Multiphysics simulation shows the distribution of current density at four kinds of contact area ratios. The green micro-LEDs with p-electrode contact area ratios of 30% demonstrated the best photoelectric performance and uniform luminous distribution.

Published
2024
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4. Investigations on Electro-Optical and Photoelectric Detection Performance of GaN-Based micro-LEDs by Removing p-AlGaN Electron-Blocking Layer

Author

Lu, Ting-Wei, Yang, Dong-Kai, Dai, Yu-Rong, Lai, Shou-Qiang, Lu, Yi-Jun, Yang, Yu-Fu, Kuo, Hao-Chung, Chen, Zhong, and Wu, Ting-Zhu

Abstract

Polarization effects introduced by the electron-blocking layer (EBL) in InGaN-based micro light-emitting diodes ( $\mu $ LEDs) have a significant impact on their display and detection applications. Therefore, the impact and necessity of EBL structure for $\mu $ LED devices intended for such applications need to be reassessed. This article investigates the effect of removing p-AlGaN EBL structure on the performance of blue $\mu $ LEDs when used as light-emitting devices under low-current injection and photodetectors (PDs). Luminescence efficiency and color stability of the $\mu $ LED without EBL improve under low-current injection due to weakened polarization-induced band-bending and enhanced hole injection and electron confinement, as numerical simulations show. For photodetection applications, removing EBL reduces the photogenerated carrier escape barrier, improving the responsivity and bandwidth of $\mu $ LED PDs. Additionally, anomalous responsivities, dependent on bias and excitation energy, were observed in $\mu $ LED PDs with EBL. These observations can be elucidated by the trap-assisted tunneling (TAT) mechanism.

Published
2024
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6. The Impacts of Optical Crosstalk on the Color Gamut of Mini-LED Integrated Matrix Device

Author

Tong, Chang-Dong, Zheng, Xi, Huang, Xiao, Zeng, Pei-Xin, Deng, Quan, Chen, Ya-Yong, Wu, Ting-Zhu, Lu, Yi-Jun, Chen, Zhong, and Guo, Wei-Jie

Abstract

Optical crosstalk between adjacent pixels acts as one of the major challenges for miniaturized light-emitting diode (mini-LED) displays. In this letter, the impacts of optical crosstalk on the chromatic characteristics of the four-in-one mini-LED integrated matrix device (IMD) have been investigated. The influence of driving current on the optical crosstalk in four-in-one IMDs has also been determined. To be specific, red mini-LEDs can compromise the color gamut of full-color self-emissive mini-LED displays. This demonstrates the crucial need to optimize the operating conditions of red mini-LEDs to alleviate optical crosstalk in displays using four-in-one IMDs. $\Delta u$ ’v’, the chromatic shift, causing by the optical crosstalk originating from red mini-LEDs reaches 0.024 and 0.045 for green and blue mini-LEDs, and the color gamut decreases from 112.00% to 102.47% under the red crosstalk.

Published
2024
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10. Two-dimensional photo-thermal distribution and structures of flip-chip mini light-emitting diodes by microscopic hyperspectral imaging

Author

Zhu, Li-Hong, primary, Du, Wu-Jun, additional, Huang, Jia-En, additional, Chen, Huan-Ting, additional, Gao, Yu-Lin, additional, Gong, Hong-Lin, additional, Tong, Chang-Dong, additional, Wu, Ting-Zhu, additional, Guo, Wei-Jie, additional, Guo, Zi-Quan, additional, Guo, Hao-Chung, additional, Chen, Zhong, additional, and Lu, Yi-Jun, additional

Published
2023
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13. Electrohydrodynamically Printed High‐resolution Arrays Based on Stabilized CsPbBr3 Quantum Dot Inks.

Author

Yang, Xiao, Yan, Zi‐Jun, Zhong, Chen‐Ming, Jia, Hui, Chen, Guo‐Long, Fan, Xiao‐Tong, Wang, Shu‐Li, Wu, Ting‐Zhu, Lin, Yue, and Chen, Zhong

Subjects
BOILING-points, PERMITTIVITY, ELECTROSTATIC interaction, SURFACE tension, SURFACE morphology, QUANTUM dots
Abstract

High‐resolution perovskite quantum dots (PeQDs) arrays printed by electrohydrodynamic (EHD) inkjet printing show great application prospects in fields of micro‐display. Commonly, EHD inkjet requires a polar system for printing but it easily quenches the PeQDs. Meanwhile, the mismatch of solvent parameters causes uneven surface morphology and printing instability. In this work, a morphology uniformization strategy of a nonpolar binary solvent system of 1,3,5‐triethylbenzene and n‐tetradecane is proposed to prepare the didodecyldimethylammonium bromide (DDAB)/PbBr2 passivated PeQDs inks. When the solvent volume ratio is 5:5, the photoluminescence quantum yield (PLQY) of the ink reaches 94.06%. Benefiting from the match of boiling point, surface tension, and dielectric constant of ink, after the EHD inkjet printing, the line width of continuous smooth line arrays is as narrow as 2.0 µm and the coffee effect of dot arrays is well inhibited. Meanwhile, derived from the strong electrostatic interaction between the π‐electron structure of 1,3,5‐triethylbenzene and DDA+, the ink exhibits high stability. Moreover, the high‐resolution logo and miniature quick responsecode by EHD inkjet printing reach 22 718 dpi, far higher than that of the reported micro‐LED. This work paves the way for high‐resolution pixel arrays of micro‐display. [ABSTRACT FROM AUTHOR]

Published
2023
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14. 2-D Photo-Thermal Distribution and Structures of Flip-Chip Mini Light-Emitting Diodes by Microscopic Hyperspectral Imaging

Author

Zhu, Li-Hong, Du, Wu-Jun, Huang, Jia-En, Chen, Huan-Ting, Gao, Yu-Lin, Gong, Hong-Lin, Tong, Chang-Dong, Wu, Ting-Zhu, Guo, Wei-Jie, Guo, Zi-Quan, Guo, Hao-Chung, Chen, Zhong, and Lu, Yi-Jun

Abstract

Given the growing interest in micro-scale thermal management of mini- and micro-light-emitting diodes (LEDs), it is crucial to develop an effective 2-D junction temperature measurement method. In this article, the microscopic hyperspectral imaging ( $\mu $ -HSI) technique has been proposed to probe the 2-D photo-thermal distribution of the flip-chip mini-LEDs. Running on a two-axis rotating platform, $\mu $ -HSI is able to directly focus on the epitaxial layer surface (episurface) and lateral side of the LED chips to acquire their 2-D spectral distributions. Subsequently, the full width at half maximum (FWHM) matrix was extracted to deduce the 2-D junction temperature distributions. As a result, the location and temperature distribution of the active layer, i.e., p-n junction, can be determined accurately. The mean temperature of the episurface approximately matches that of the active layer. The Raman shift method was applied to verify the accuracy of the $\mu $ -HSI technique. In addition, the extra fine structures as well as temperature distributions of the interface between the episurface and sapphire or electrodes are distinguished and analyzed by this technique. This work offers an effective tool for the quality improvement and thermal management of mini-LEDs.

Published
2023
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17. Investigation on Circadian Action and Color Quality in Laser-Based Illuminant for General Lighting and Display

Author

Lei, Shuo-Di, primary, Liu, Bi-Jing, additional, Gao, Yang, additional, Dong, Xiao-Ya, additional, Gong, Yu-Jia, additional, Xu, Jian, additional, Xu, Yun-Xin, additional, Wang, Dong, additional, Guo, Zi-Quan, additional, Wu, Ting-Zhu, additional, Zhou, Chen-Liang, additional, Cai, Zong-Jian, additional, Lu, Yi-Jun, additional, and Chen, Zhong, additional

Published
2020
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19. Giant Optical Anisotropy of Perovskite Nanowire Array Films

Author

Lin, Chun‐Ho, primary, Kang, Chieh‐Yu, additional, Wu, Ting‐Zhu, additional, Tsai, Chun‐Lin, additional, Sher, Chin‐Wei, additional, Guan, Xinwei, additional, Lee, Po‐Tsung, additional, Wu, Tom, additional, Ho, Chih‐Hsiang, additional, Kuo, Hao‐Chung, additional, and He, Jr‐Hau, additional

Published
2020
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20. Investigation on The Circadian Action Factor of RGB White LEDs

Author

史. 园. Shi Yuan, 高玉琳 Gao Yulin, 郭自泉 Guo Ziquan, 陈. 忠. Chen Zhong, 吴挺竹 Wu Ting-Zhu, 郑莉莉 Zheng Li-Li, 严. 威. Yan Wei, and 吕毅军 Lyu Yi-Jun

Subjects
Radiation, Materials science, Optics, law, business.industry, RGB color model, Nanotechnology, Circadian rhythm, Condensed Matter Physics, business, Electronic, Optical and Magnetic Materials, Light-emitting diode, law.invention
Published
2016
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21. White Light‐Emitting Diodes: Highly Efficient and Stable White Light‐Emitting Diodes Using Perovskite Quantum Dot Paper (Adv. Sci. 24/2019)

Author

Kang, Chieh‐Yu, primary, Lin, Chun‐Ho, additional, Lin, Chih‐Hao, additional, Li, Ting‐You, additional, Huang Chen, Sung‐Wen, additional, Tsai, Chun‐Lin, additional, Sher, Chin‐Wei, additional, Wu, Ting‐Zhu, additional, Lee, Po‐Tsung, additional, Xu, Xuezhu, additional, Zhang, Maolin, additional, Ho, Chih‐Hsiang, additional, He, Jr‐Hau, additional, and Kuo, Hao‐Chung, additional

Published
2019
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23. Highly Efficient and Stable White Light‐Emitting Diodes Using Perovskite Quantum Dot Paper

Author

Kang, Chieh‐Yu, primary, Lin, Chun‐Ho, additional, Lin, Chih‐Hao, additional, Li, Ting‐You, additional, Huang Chen, Sung‐Wen, additional, Tsai, Chun‐Lin, additional, Sher, Chin‐Wei, additional, Wu, Ting‐Zhu, additional, Lee, Po‐Tsung, additional, Xu, Xuezhu, additional, Zhang, Maolin, additional, Ho, Chih‐Hsiang, additional, He, Jr‐Hau, additional, and Kuo, Hao‐Chung, additional

Published
2019
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