Organic Semiconductor Lab
Research Field
Prof. Chih-Hao Chang received his Ph.D. in Electro-Optical Engineering from National Taiwan University in 2009. He joined Yuan Ze University as an Assistant Professor the same year and was promoted to Full Professor in 2017. He is currently a Distinguished Professor in the Department of Electrical Engineering at Yuan Ze University. With more than fifteen years of research experience, Prof. Chang has demonstrated sustained dedication to the development of organic semiconductors and their applications in advanced optoelectronic devices. His research interests include organic semiconductor materials, metal oxides, organic light-emitting devices, and flexible optoelectronics, with particular emphasis on OLED technologies for display, lighting, and phototherapy applications.
My laboratory is fully equipped with comprehensive facilities for the fabrication and characterization of organic optoelectronic devices. The experimental platform has been systematically established to support the complete workflow from material evaluation to device performance analysis. For device fabrication, the laboratory is equipped with thin-film deposition systems, including thermal evaporation under high vacuum, enabling the precise construction of multilayer OLED architectures. Controlled environments are implemented to ensure reproducibility and minimize contamination during device processing. For material and device characterization, a wide range of measurement systems is available. These include current–voltage–luminance characterization, external quantum efficiency measurement, electroluminescence spectroscopy, and lifetime testing systems for evaluating operational stability. In addition, photophysical characterization tools such as photoluminescence spectroscopy and transient measurements are employed to investigate exciton dynamics and emission properties.
My research focuses on the development and physical understanding of advanced organic optoelectronic devices, particularly organic light-emitting diodes (OLEDs), through a device-oriented and application-driven approach. The core objective is to bridge the gap between newly developed organic semiconducting materials and their practical implementation in high-performance devices. The main research topics are outlined as follows:
- Device-Level Evaluation and Validation of Emerging Organic Semiconductors
- Exciton Dynamics and Efficiency Loss Mechanisms in OLEDs
- Engineering of Device Architectures for Optimized Charge Balance
- Investigation of Advanced Emissive Systems (TADF and Beyond)
- Flexible and Application-Oriented OLED Technologies
Prof. Chang has published over 130 papers in internationally recognized journals and is a co-inventor of eight patent applications. His publications have received more than 5,900 citations, corresponding to an h-index of 41. His honors include the Excellent Paper Award from the NSC Engineering Technology Promotion Center (2010), the YZU Young Scholar Research Award (2013), the YZU Research Excellence Awards (2015 and 2018), and the Teaching Excellence Awards from the YZU College of Electrical and Communication Engineering (2017 and 2018). He also received the Silver and Copper Medals at Taipei International Invention & Technology Exhibition (2017 and 2023), the Outstanding Research Talent Award from the Ministry of Science and Technology (2014–2025), the 16th, 19th, and 22nd Y. Z. Hsu Outstanding Professor Awards, and the 21st Y. Z. Hsu Chair Professor Award. He was elected a Fellow of the International Association of Advanced Materials (IAAM) in 2023, received the National Academic Medal of International Outstanding Inventor in 2024, and was awarded the Outstanding Electrical Engineering Professor Award by the Chinese Society for Electrical Engineering in 2025.
Prof. Chih-Hao Chang received his Ph.D. in Electro-Optical Engineering from National Taiwan University in 2009.
Job Description
- Engage in the development of stable TADF materials with high photoluminescence quantum yield.
- Investigate solvent-dependent emission behavior (solvatochromism) in systems such as THF and toluene.
- Explore aggregation-induced emission and solid-state photophysical properties.
- Optimize thermal and morphological stability for long-term OLED performance.
Preferred Intern Educational Level
postgraduate
Skill sets or Qualities
- Background in chemistry, materials science, or physics
- Basic understanding of photophysics and organic electronics
- Laboratory experience (preferred but not mandatory)
Job Description
- Engage in the development of stable TADF materials with high photoluminescence quantum yield.
- Investigate solvent-dependent emission behavior (solvatochromism) in systems such as THF and toluene.
- Explore aggregation-induced emission and solid-state photophysical properties.
- Optimize thermal and morphological stability for long-term OLED performance.
Preferred Intern Educational Level
postgraduate
Skill sets or Qualities
- Background in chemistry, materials science, or physics
- Basic understanding of photophysics and organic electronics
- Laboratory experience (preferred but not mandatory)