Influence of shell thickness on the performance of light-emitting devices based on CdSe/Zn1-X CdX S core/shell heterostructured quantum dots.
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.
Division of Chemistry, Los Alamos National Laboratory, New Mexico, 87544, USA.
Jaehoon
J
Lim
Byeong Guk
BG
Jeong
Myeongjin
M
Park
Jai Kyeong
JK
Kim
Jeffrey M
JM
Pietryga
Young-Shin
YS
Park
Victor I
VI
Klimov
Changhee
C
Lee
Doh C
DC
Lee
Wan Ki
WK
Bae
charging; efficiency roll-off; energy transfer; light-emitting devices; type-I heterostructures