Boosting oleds performance via hot exciton mechanism : a study of heteroatom and different number of donor unit effects on D-Pi-A type emitters
6
Issued Date
2023
Copyright Date
2023
Resource Type
Language
eng
File Type
application/pdf
No. of Pages/File Size
xxii, 185 leaves ; 30 cm.
Access Rights
open access
Rights
ผลงานนี้เป็นลิขสิทธิ์ของมหาวิทยาลัยมหิดล ขอสงวนไว้สำหรับเพื่อการศึกษาเท่านั้น ต้องอ้างอิงแหล่งที่มา ห้ามดัดแปลงเนื้อหา และห้ามนำไปใช้เพื่อการค้า
Rights Holder(s)
Mahidol University
Bibliographic Citation
Thesis (Ph.D. (Chemistry))--Mahidol University, 2023
Suggested Citation
Takdanai Unjarern Boosting oleds performance via hot exciton mechanism : a study of heteroatom and different number of donor unit effects on D-Pi-A type emitters. Thesis (Ph.D. (Chemistry))--Mahidol University, 2023. Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/117633
Title
Boosting oleds performance via hot exciton mechanism : a study of heteroatom and different number of donor unit effects on D-Pi-A type emitters
Author(s)
Abstract
This study is about the design, synthesis, and characterization of (D–π–A) type fluorescent materials as well as the study of the effect of the different number of donor moieties on the photophysical and electroluminescent properties using IDL as an electron donor unit and TAZ derivative as an electron acceptor unit. Furthermore, research objectives were not only on the effects of the number of donor units but also the heteroatom effects. Therefore, BTI, which contains one sulfur atom instead of nitrogen atom was employed as another donor specie. Hence, the physical properties of six emissive materials, namely IDL-1, IDL-2, IDL-3 for IDL-TAZ series BTI-1, BTI-2 and BTI-3 for BTI-TAZ series were systematically studied. The doped devices of IDL-TAZ series showed green emission with high luminance and maximum EQE over 5%. Among them, the emitter IDL-3 showed the highest EQE value of 7.50%. In case of BTI-TAZ series, their doped devices showed skyblue emission. The compound BTI-3 presented maximum EQE value of 3.62%. Interestingly, all devices exhibited high exciton unitization efficiency (Eta subscript s) of 69, 60, 71, 41, 40 and 86% for IDL-1, IDL-2, IDL-3 BTI-1, BTI-2 and BTI-3, respectively. This high (Eta subscript s) was promoted via hot exciton mechanism.
Degree Name
Doctor of Philosophy
Degree Level
Doctoral degree
Degree Department
Faculty of Science
Degree Discipline
Chemistry
Degree Grantor(s)
Mahidol University