Session Index

S7. Display and Solid State Lighting

Display and Solid State Lighting I
Friday, Dec. 1, 2023  13:00-15:00
Presider: Prof. Shie-Chang Jeng (National Yang Ming Chiao Tung University, Taiwan) Prof. Jian-Jang Huang (National Taiwan University, Taiwan)
Room: 92277 (2F)
13:00 - 13:30
Manuscript ID.  0651
Paper No.  2023-FRI-S0701-I001
Invited Speaker:
Tsung-Hsien Lin
Technological Development of Liquid Crystal Smart Window
Tsung-Hsien Lin, National Sun Yat-Sen University (Taiwan)

Smart window is the films/glasses having the incredible feature of controlling heat, privacy, and getting their transmission properties changed from opaque to translucent to transparent under the influence of voltage. The flow of light and heat between indoor and outdoor is controllable, providing human life more convenient and comfortable. This market is expected to witness notable growth in the coming years due to the increasing demand of smart film/glass based products in various industrial sectors, such as automotive and construction. Smart window technique such as Polymer dispersed liquid crystal (PDLC), Electrochromic glass (EC) and Suspended particles devices (SPD) accounted for 90% of the market. However, these techniques can be only operated at a single function. In order to achieve true energy conservation and versatility, it is highly desirable but challenging to design a single device capable of simultaneously modifying haze and tint as well as exhibiting multi-stability. In this presentation, I will talk about the recent technology and development of multi-functional LC smart windows.

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13:30 - 13:45 Award Candidate (Paper Competition)
Manuscript ID.  0183
Paper No.  2023-FRI-S0701-O001
Guan-Fu Sung A misrecognized heating effect originating seemingly from dielectric relaxation in a dual-frequency liquid crystal cell
Guan-Fu Sung, College of Photonics (Taiwan); Wei Lee, Institute of Imaging and Biomedical Photonics (Taiwan)

Our previous research has attracted considerable attention due to our newfound understanding of the pseudo-dielectric relaxation-induced heating effect, known as pseudo-dielectric heating (PDH). It has often been mistakenly considered as dielectric heating (DH) caused by orientational relaxation in liquid crystal (LC). However, the (co)existence of both PDH and DH effects in dual-frequency (DF) LC cells remains unclear. In this study, we unveil a completely new and never-before-seen heating behavior in a DFLC cell, ultimately providing evidence for the independent existence of DH and PDH behaviors in a DFLC cell.

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13:45 - 14:00 Award Candidate (Paper Competition)
Manuscript ID.  0171
Paper No.  2023-FRI-S0701-O002
Yu-Hua Chou Microfluidic laser based on polymeric chiral nematic liquid crystal cavity
Yu-Hua Chou, Jia-De Lin, National Dong Hwa University (Taiwan)

This work demonstrates the first miniature dye laser integrating a microfluidic gain medium and a self-organized laser cavity composed of a chiral nematic liquid crystal polymer template. The emission features of the microfluidic laser and the static laser are compared. By
continuously infiltrating fluidic gain medium into the chiral nematic polymer template, the lasting time for the lasing emission can be significantly prolonged compared to the static one. The prototype proposed in this work moves liquid crystal lasers further toward practical applications.

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14:00 - 14:15 Award Candidate (Paper Competition)
Manuscript ID.  0771
Paper No.  2023-FRI-S0701-O003
Zhi-Qun Wang Electro-regulatable reflective optical vortex generator based on polymer stabilized cholesteric liquid crystals
Zhi-Qun Wang, You-Jyun Chen, Chia-Rong Lee, National Cheng Kung University (Taiwan)

This experiment combines polymer-stabilized cholesteric liquid crystals (PSCLCs) reflection band broadening and planar phase modulation techniques, allowing cholesteric liquid crystals, typically characterized by narrow reflection bands, to achieve full visible light operation under applied electric fields. Taking the vortex beam element as an example and verified through Michelson interferometry, the fabricated device simultaneously reflects red, green, and blue vortex beams under low voltage (≤16 V) modulation, confirming the feasibility of applying PSCLC technology in planar phase elements.

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14:15 - 14:30 Award Candidate (Paper Competition)
Manuscript ID.  0788
Paper No.  2023-FRI-S0701-O004
Yuan-Chao Wang Improving Output Power Efficiency of InGaN/GaN Green Micro-LEDs through Selective Sidewall Ion Implantation
Yuan-Chao Wang, Yu-Hsiang Chang, Jian-Jang Huang, NTU (Taiwan)

In this work, we propose an ion implantation method to deliberately create high-resistivity sidewall in the InGaN/GaN green LED. Our study demonstrates that ion implantation improves electrical properties, manifested by increased forward current and decreased reverse leakage, mainly due to the effective suppression of sidewall defects.

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14:30 - 14:45 Award Candidate (Paper Competition)
Manuscript ID.  0757
Paper No.  2023-FRI-S0701-O005
Huai-Chin Huang The effects of V-defect semipolar sidewall plane on the red InGaN MQW LEDs with random alloy fluctuation effects
Huai-Chin Huang, Shih-min Chen, Yuh-Renn Wu, National Taiwan University (Taiwan)

Strong piezoelectric field-induced barriers hinder vertical QW injection in red nitride-based light-emitting diodes (LEDs). The V-defects can decrease the forward voltage (Vfor) with the semipolar InGaN QW at the inclined surface. Simulations demonstrate that the primary light-emitting QW layer will shift whenever the QW number rises to 10 due to the carrier injection, whether or not the V-defect is considered. Also, the indium composition on the sidewall affects carrier injection and balance. This study will analyze the impact of the QW number, the structure of the V-defect, and the indium composition of the inclined sidewall QW.

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14:45 - 15:00 Award Candidate (Paper Competition)
Manuscript ID.  0986
Paper No.  2023-FRI-S0701-O006
Ting-Jhih Kuo An investigation on an over-3000-PPI color conversion layer with colloidal quantum dots
Ting-Jhih Kuo, Han-Yu Chao, Chien-Chung Lin, National Taiwan University (Taiwan)

In this study, we demonstrate the QD patterning, which can be considered as a micro-sized color
conversion layer. Our QD patterning size is 2um, and it is achieved via dropping QD solution and
semiconductor processes.

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