TiO2 나노입자를 혼합 발광층으로 사용한 장수명 양자점 발광다이오드 (Stable Quantum Dot Light-Emitting Diodes Employing TiO2 Nanoparticles as a Mixed Emission Layer)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 61권 / 1호 / 33 ~ 37페이지
· 저자명 : 윤창기, 김지완

초록

Colloidal quantum dots (QDs) have attractive optical and electrical characteristics for variousapplications in the display industry. They have superb properties including color tunability, which is achievedby controlling the particle size and solution processes used for quantum dot light-emitting diodes (QLEDs).
Here we demonstrate high efficiency QLEDs that consist of a mixed layer of TiO2 nanoparticles (NPs) andQDs. ZnO is the key material responsible for the promising results of the electroluminescence devices, whichexhibited well-matched energy levels and robustness. In this report, Li-doped TiO2 NPs were synthesizedunder ambient conditions as an alternative electron transport layer (ETL) for QLEDs. A stable mixture ofTiO2 NPs and QDs was prepared in chlorobenzene and then applied to QLEDs without a conventional ETL.
QLEDs with such a simplified structure produce a maximum luminance of 123,311 cd/m2 with a currentefficiency of 40.5 cd/A. These results are comparable to those of conventional QLEDs. Additionally, thepredicted T50 at 100 cd/m2 was 1,420 h, based on the T50 at 1,600 cd/m2. These clearly indicate not only thepromising results of the TiO2 NPs as an inorganic ETL, but also the remarkable performance of the simplifieddevice with less layers. The reduction in fabrication steps using this solution-based process is alsoadvantageous for next-generation display technology.

영어초록

Colloidal quantum dots (QDs) have attractive optical and electrical characteristics for variousapplications in the display industry. They have superb properties including color tunability, which is achievedby controlling the particle size and solution processes used for quantum dot light-emitting diodes (QLEDs).
Here we demonstrate high efficiency QLEDs that consist of a mixed layer of TiO2 nanoparticles (NPs) andQDs. ZnO is the key material responsible for the promising results of the electroluminescence devices, whichexhibited well-matched energy levels and robustness. In this report, Li-doped TiO2 NPs were synthesizedunder ambient conditions as an alternative electron transport layer (ETL) for QLEDs. A stable mixture ofTiO2 NPs and QDs was prepared in chlorobenzene and then applied to QLEDs without a conventional ETL.
QLEDs with such a simplified structure produce a maximum luminance of 123,311 cd/m2 with a currentefficiency of 40.5 cd/A. These results are comparable to those of conventional QLEDs. Additionally, thepredicted T50 at 100 cd/m2 was 1,420 h, based on the T50 at 1,600 cd/m2. These clearly indicate not only thepromising results of the TiO2 NPs as an inorganic ETL, but also the remarkable performance of the simplifieddevice with less layers. The reduction in fabrication steps using this solution-based process is alsoadvantageous for next-generation display technology.

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