Giant Shell Nanorods for High-Efficiency and Low-Roll-Off Light-Emitting Diodes

TY - JOUR

T1 - Giant Shell Nanorods for High-Efficiency and Low-Roll-Off Light-Emitting Diodes

AU - Liu, Xiaonan

AU - Zeng, Yicheng

AU - Liu, Yuan

AU - Chen, Weiwei

AU - Wang, Qingya

AU - Wei, Jing

AU - Liu, Fangze

AU - Li, Hongbo

N1 - Publisher Copyright: © 2025 Wiley-VCH GmbH.

PY - 2026/1/8

Y1 - 2026/1/8

N2 - 1D colloidal semiconductor nanorods (NRs) offer polarized emission and enhanced photon out-coupling efficiency for high-efficiency light-emitting diodes (LEDs). However, their practical application has been limited by severe efficiency roll-off at high current densities due to thin radial shells along the radial direction and the high aspect ratio that leads to random orientation during the fabrication of solution-processed films, which causes structural gaps, triggering leakage currents and ultimately exacerbating efficiency roll-off. Here, fatty acid is introduced to mitigate the c-axial growth induced by phosphonic acid in traditional NRs synthesis, while promoting radial shell growth, thereby forming giant-shell CdSe/CdZnSe/CdS/CdZnS NRs with an aspect ratio of ≈2.2. This design effectively alleviates electron leakage caused by random orientation in NR films, while minimizing interfacial defects and Auger recombination, achieving a near-unity PLQY. Consequently, NR-LEDs based on these NRs exhibit a peak external quantum efficiency (EQE) of 23.4% and a luminance of 289 000 cd m−2. Significantly, this NR design greatly suppresses the EQE roll-off at high current density. Furthermore, the devices have a long T95 lifetime of more than 10 000 h at a luminance of 1 000 cd m−2. This material design strategy lays the foundation for realizing highly polarized NR-LEDs for efficient high-definition displays.

AB - 1D colloidal semiconductor nanorods (NRs) offer polarized emission and enhanced photon out-coupling efficiency for high-efficiency light-emitting diodes (LEDs). However, their practical application has been limited by severe efficiency roll-off at high current densities due to thin radial shells along the radial direction and the high aspect ratio that leads to random orientation during the fabrication of solution-processed films, which causes structural gaps, triggering leakage currents and ultimately exacerbating efficiency roll-off. Here, fatty acid is introduced to mitigate the c-axial growth induced by phosphonic acid in traditional NRs synthesis, while promoting radial shell growth, thereby forming giant-shell CdSe/CdZnSe/CdS/CdZnS NRs with an aspect ratio of ≈2.2. This design effectively alleviates electron leakage caused by random orientation in NR films, while minimizing interfacial defects and Auger recombination, achieving a near-unity PLQY. Consequently, NR-LEDs based on these NRs exhibit a peak external quantum efficiency (EQE) of 23.4% and a luminance of 289 000 cd m−2. Significantly, this NR design greatly suppresses the EQE roll-off at high current density. Furthermore, the devices have a long T95 lifetime of more than 10 000 h at a luminance of 1 000 cd m−2. This material design strategy lays the foundation for realizing highly polarized NR-LEDs for efficient high-definition displays.

KW - external quantum efficiency

KW - giant shell

KW - lifetimes

KW - light-emitting diodes

KW - nanorods

KW - roll-off

UR - https://www.scopus.com/pages/publications/105016820887

U2 - 10.1002/adma.202513097

DO - 10.1002/adma.202513097

M3 - Article

AN - SCOPUS:105016820887

SN - 0935-9648

VL - 38

JO - Advanced Materials

JF - Advanced Materials

IS - 2

M1 - e13097

ER -