Date
Place
- Room H (Room Hall 1, 1F)
- P1. Poster Session I
- August 20, 2015 (Thursday)
- 14:00 ~ 15:30
- [P1-11]
- 14:00 ~ 15:30
- Title:The Influence of the Dimensions of CdSe/Cd1-XZnXS Core/Shell Type-I Heterostructured Quantum Dots on the Performances of Light-Emitting Devices
- Jun Hyuk Chang (Seoul Nat'l Univ., Korea), Byeong Guk Jeong (KAIST, Korea), Kookheon Char (Seoul Nat'l Univ., Korea), and Wan Ki Bae (KIST, Korea)
Abstract: We have investigated the relationship between the dimensions of core/shell heterostructured quantum dots (QDs) with the performances oflight-emitting diodes (LEDs). For comparative study, we have synthesized a series of CdSe/Zn1-XCdXS core/shell type-I heterostructured QDs having similar optical properties (e.g., photoluminescence energy, full width at half maximum, photoluminescence quantum yield, single exciton lifetime) but varying shell thicknesses (core radius: 2.0 nm, 2.5 nm<= shell thickness <= 6.3 nm). Upon the inverted device architecture, thick-shell QDs have shown higher efficiency andoperational stabilityalong the current sweep within the actual devices.Spectroscopic analysis reveals thatthe suppression of energy transfer and QD charging in thick-shell QDs is indeed responsible for the improved device performances. As an ultimate achievement, deep-red QD-LEDs (lmax = 630 nm)exhibitingpeak external quantum efficiency of 7.4 % and record-high brightnessabove 100,000 cd/m2could be realized based on the type-I giant QDs (core radius: 2.0 nm, shell thickness: 6.3 nm).
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