Influence of shell thickness on the performance of light-emitting devices based on CdSe/Zn1-X CdX S core/shell heterostructured quantum dots.

Lim, Jaehoon; Jeong, Byeong Guk; Park, Myeongjin; Kim, Jai Kyeong; Pietryga, Jeffrey M; Park, Young-Shin; Klimov, Victor I; Lee, Changhee et al. · Adv Mater · 2014

basic_science · Level V

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Abstract

CdSe/Zn1-X CdX S core/shell heterostructured quantum dots (QDs) with varying shell thicknesses are studied as the active material in a series of electroluminescent devices. "Giant" CdSe/Zn1-X CdX S QDs (e.g., CdSe core radius of 2 nm and Zn1-X CdX S shell thickness of 6.3 nm) demonstrate a high device efficiency (peak EQE = 7.4%) and a record-high brightness (>100 000 cd m(-2) ) of deep-red emission, along with improved device stability.