TY - JOUR
T1 - Efficient Near-Infrared CdSe/CdZnSe/CdZnS Core/Shell/Shell Nanoplatelet Light-Emitting Diodes by Controlling Gradient Alloy Shells
AU - Sun, Yingying
AU - Zeng, Yicheng
AU - Wang, Qingya
AU - Liu, Xiaonan
AU - Li, Min
AU - Manna, Liberato
AU - Wei, Jing
AU - Liu, Fangze
AU - Li, Hongbo
N1 - Publisher Copyright:
© 2026 American Chemical Society
PY - 2026/9/9
Y1 - 2026/9/9
N2 - Colloidal nanoplatelets (NPLs) have attracted significant attention for light-emitting diodes (LEDs) owing to their strong in-plane dipole moments and intrinsically narrow emission linewidth. In this study, we report the synthesis of near-infrared (NIR)-emitting CdSe/CdZnSe/CdZnS core/shell/shell NPLs with uniform size and well-controlled shell composition. The optimized NPLs exhibit a PL emission peak at 715 nm, a narrow full width at half maximum of 21 nm, and a high photoluminescence quantum yield of 54%. The gradient-alloy CdZnSe/CdZnS shell effectively suppresses nonradiative recombination and enhances carrier confinement within the CdSe core. Consequently, solution-processed LEDs incorporating these NPLs achieve a low turn-on voltage of 1.8 V and a maximum luminance of 6415 cd m–2. This work establishes an effective synthetic strategy for gradient-shell CdSe NPLs and provides a promising platform for high-performance NIR optoelectronic devices.
AB - Colloidal nanoplatelets (NPLs) have attracted significant attention for light-emitting diodes (LEDs) owing to their strong in-plane dipole moments and intrinsically narrow emission linewidth. In this study, we report the synthesis of near-infrared (NIR)-emitting CdSe/CdZnSe/CdZnS core/shell/shell NPLs with uniform size and well-controlled shell composition. The optimized NPLs exhibit a PL emission peak at 715 nm, a narrow full width at half maximum of 21 nm, and a high photoluminescence quantum yield of 54%. The gradient-alloy CdZnSe/CdZnS shell effectively suppresses nonradiative recombination and enhances carrier confinement within the CdSe core. Consequently, solution-processed LEDs incorporating these NPLs achieve a low turn-on voltage of 1.8 V and a maximum luminance of 6415 cd m–2. This work establishes an effective synthetic strategy for gradient-shell CdSe NPLs and provides a promising platform for high-performance NIR optoelectronic devices.
KW - anisotropic nanocrystals
KW - colloidal nanoplatelets
KW - external quantum efficiency
KW - gradient alloy shells
KW - light-emitting diodes
KW - near-infrared
UR - https://www.scopus.com/pages/publications/105049655738
U2 - 10.1021/acsami.6c07817
DO - 10.1021/acsami.6c07817
M3 - Article
C2 - 42674549
AN - SCOPUS:105049655738
SN - 1944-8244
VL - 18
SP - 47961
EP - 47970
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 35
ER -