Session Index

S7. Display and Solid State Lighting

Display and Solid State Lighting III
Saturday, Dec. 2, 2023  10:45-12:00
Presider: Prof. Shun-Wei Liu (Ming Chi University of Technology, Taiwan)
Room: 92277 (2F)
10:45 - 11:15
Manuscript ID.  1092
Paper No.  2023-SAT-S0703-I001
Invited Speaker:
Jin Jang
A Study on Stretchable Active-Matrix Micro-LED Electronics
Jin Jang, Kyung Hee University (Taiwan)

I will talk about the issues related with stretchable AM electronics using oxide TFT array. I will discuss on the LTPO circuits for gate driver, EM gate driver, PWM pixel circuits for micro-LED displays. I will also discuss the transfer technology of micro-LEDs, and bonding to TFT array on stretchable PDMS substrate. We used the liquid metal for stretchable interconnection which is a key technology for stretchable electronics. The AM micro-LED display we have demonstrated could have 20% stretchability. I will conclude my talk by explain-ing some recent results on TFT electronics in ADRC.

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11:15 - 11:30
Manuscript ID.  0111
Paper No.  2023-SAT-S0703-O001
Yu-Ying Hung Ameliorating Uniformity and Color Conversion Efficiency of Blue and Quantum Well Intermixing UV Hybrid Micro-LED Display
Yu-Ying Hung, Tzu-Yi Lee, National Yang Ming Chiao Tung University (Taiwan); Wen-Chien Miao, Hon Hai Research Institute (Taiwan), National Yang Ming Chiao Tung University (Taiwan); Hao-Chung Kuo, National Yang Ming Chiao Tung University (Taiwan), Hon Hai Research Institute (Taiwan)

In this study, we used LightTools to simulate excitation of red and green quantum dots (QDs) and TiO2 QD photoresist by UV light from light-emitting diodes (LEDs). By fine-tuning QD and TiO2 concentrations and film thickness, we selected a QD film with 35% QD concentration, 17.5% TiO2, and 2 µm thickness. Simulation showed photoluminescence quantum yield of 57.8% for red and 45% for green QDs. For better color conversion efficiency, we added a multi-layer distributed Bragg reflector and combined red, green QDs with blue micro-LED for full-color display.

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11:30 - 11:45
Manuscript ID.  0491
Paper No.  2023-SAT-S0703-O002
Yulin Lin Regulating the triplet-triplet annihilation to fluorescence in polymer light-emitting diode
Yulin Lin, Mujahid1 Anas, Shi-Hong Luo, Chih-Ting Li, Tzung-Fang Guo, National Cheng Kung University (Taiwan)

Using magnetoelectroluminescence fingerprints, we observed significant triplet-triplet annihilation (TTA) processes in green poly(9,9-dialkylfluorene) derivative (G-PF)-based devices. TTA intensity was regulated through devices cathode structures. Adding a layer to block excitons increased triplet density and reduced metal cathode-induced quenching, improving TTA by 1.5 times. Importantly, the luminous efficiency also improved with the enhancement of TTA. Rational device design optimizes the advantages of TTA. In conclusion, TTA enhances the light emission of G-PF devices, thereby improving efficiency.

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11:45 - 12:00
Manuscript ID.  0495
Paper No.  2023-SAT-S0703-O003
Anas Mujahid Magneto-electroluminescence Mediated by Magneto-conductance Polar Pair Model in Polymer and Thermally Activated Delayed Fluorescence Emitter-based Light Emitting Diodes
Anas Mujahid, Yulin Lin, Chih-Ting Li, Wei-Cheng Liu, National Cheng Kung University (Taiwan); Yi-Ting Lee, Soochow University (Taiwan); Tzung-Fang Guo, National Cheng Kung University (Taiwan)

Herein, we spectacle the precise technique to measure the magneto electro-luminance (MEL) by proposing a novel polaron pair model which depicts that positive magnetoconductance (MC) results directly from the polaron pairs dissociation and negative MC results from the triplet exciton charge reaction owing to the balanced and unbalanced device. Our model suggests that positive MEL results from the singlet exciton contributed to the positive MC. We validate our model by deploying it on the balanced and unbalanced light-emitting diodes (polymer and thermally activated delayed fluorescence based). We authenticate the MEL analysis is more trustworthy if measured at a constant current.

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