Session Index

S7. Display and Solid State Lighting

Display and Solid State Lighting VI
Sunday, Dec. 3, 2023  09:00-11:00
Presider: Prof. Chih-Hao Chang (Yuan Ze University, Taiwan) Prof. Tsung-Hsien Lin (National Sun Yat-sen University, Taiwan)
Room: 92277 (2F)
09:00 - 09:30
Manuscript ID.  1076
Paper No.  2023-SUN-S0706-I001
Invited Speaker:
Tae-Woo Lee
Perovskite Nanocrystals for High-Efficiency, Stable and Large-area Light-Emitting Diodes
Tae-Woo Lee, Seoul National University (Korea)

Metal halide perovskites (MHPs) are potential next-gen display emitters due to high color
purity and affordability. Despite their promise, they still trail existing LEDs in efficiency and
stability. This presentation discusses commercialization strategies for MHPs. We introduce a
material strategy to suppress defect formation in perovskite nanocrystals (PNC). Techniques
include doping with guanidinium for improved carrier confinement and using a bromine-based
molecule for halide vacancy healing. A modified-bar coating allows for efficient large-area
applications. Moreover, an in-situ core/shell PNC structure boosts efficiency and device
lifetime by enhancing charge transport and confinement

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09:30 - 09:45
Manuscript ID.  0407
Paper No.  2023-SUN-S0706-O001
Chen-Da Du Applying Surface Plasmon Resonance to 355-nm Ultraviolet Light Emitting Diodes
Chen-Da Du, National Central University (Taiwan), Academia Sinica (Taiwan); Kun-Yu Lai, National Central University (Taiwan)

355-nm UV LEDs were grown on sapphire substrates. The devices were fabricated with Al electrodes on the p-GaN contact layer with varied thickness. According to photoluminescence (PL) measurements, it was observed that the LED device exhibited the surface plasmon resonance (SPR) effect when the Al electrode and AlGaN multiple quantum well (MQW) were separated by 50-nm of p-GaN (grown for 5 minutes).

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09:45 - 10:00
Manuscript ID.  0067
Paper No.  2023-SUN-S0706-O002
Tsun-Han Wang Thermo-responsive smart glass
Tsun-Han Wang, Shie-Chang Jeng, National Yang Ming Chiao Tung University (Taiwan)

Nearly 40% of global energy is consumed in buildings, of which windows are the least energy-efficient one in building envelopes. An eco-friendly aqueous solution with surfactant is applied as the thermo-responsive dimmers to solve both of the solar radiant and privacy.

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10:00 - 10:15
Manuscript ID.  0246
Paper No.  2023-SUN-S0706-O003
Meng-Shu Rao Optimization of EL Intensities in Hybrid 2-D WSe2/AlGaInP Light Emitting Device through Dielectric Layer Thickness Engineering
Meng-Shu Rao, Ya-Hui Chang, Yen-Shou Lin, Academia Sinica (Taiwan), National Yang-Ming Chiao-Tung University (Taiwan); Konthoujam James Singh, Academia Sinica (Taiwan); Min-Hsiung Shih, Academia Sinica (Taiwan), National Yang-Ming Chiao-Tung University (Taiwan)

Multi-wavelength light-emitting devices have significant applications in various fields, such as displays and optical communication systems. In this study, we investigated the optimization of electroluminescence (EL) intensities in hybrid 2-D WSe2/AlGaInP quantum wells light-emitting devices with different thicknesses of AlOx layer. Increasing the AlOx thickness resulted in higher threshold voltages and reduced EL intensities ratio between GaP-based multiple quantum wells (MQWs) and WSe2 monolayer, offering the potential for optimized full-color light emitting devices.

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10:15 - 10:30
Manuscript ID.  0343
Paper No.  2023-SUN-S0706-O004
Yu-Min Chang Sub-pixel-matched meta-collimator array design for micro-light-emitting diode display
Yu-Min Chang, Teng-Li Shao, Wen-Hsuan Hsieh, Tien-Chiu Chen, Hung-Chang Hsieh, Yao-Wei Huang, Tien-Chang Lu, Chia-Yen Huang, National Yang Ming Chiao Tung University (Taiwan)

We proposed a metasurface collimator array made of GaN circular pillars, whose span matched the sub-pixel of a 3000 pixel-per-inch micro-light-emitting diode (μ-LED) display. Finite-difference time-domain simulation revealed the well-designed meta-collimator could narrow the divergence angle from 118 degree to 4.8 degree. The integrated intensity within ±10 degree divergence could be enhanced 13.6-fold after capping the μ-LED display with the subpixel-matched meta-collimator array with an optimized airgap in between.

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10:30 - 10:45
Manuscript ID.  0355
Paper No.  2023-SUN-S0706-O005
Jo-Hsiang Chen High quality Liquid-type White Light-emitting Diode with Zn0.8Cd0.2S White Quantum Dots
Jo-Hsiang Chen, Tsung-Sheng Kao, Hao-Chung Kuo, National Yang Ming Chiao Tung University (Taiwan)

In this study, liquid-type WQDs were demonstrated to be highly efficient color conversion layers in UV LED packaging. We designed a glass box to protect the white light Zn0.8Cd0.2S (Zn0.8 for short) quantum dot material, keeping it in a liquid state to improve the luminous efficiency and reliability of WQD-based devices. The luminous efficiency, color rendering index (CRI) and correlated color temperature (CCT) of the liquid-type white QD LED (LWQD-WLED) are 332lm/Wop, higher than 80 and 4360K, respectively. Furthermore, the ultrahigh reliability of the devices means progress towards the superior performance of commercially viable solid-state lighting.

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