Video Experimental Relacionado

Updated: Jan 29, 2026

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes

Published on: November 16, 2018

Baja eficiencia de caída y alta eficiencia de corriente en diodos emisores de luz habilitados por pozos cuánticos

Jingjing Qiu¹, Yunke Zhu¹, Peng Bai^1,2

¹State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing, China.

Advanced materials (Deerfield Beach, Fla.)

|January 28, 2026

Abstract:

Colloidal quantum well light-emitting diodes (CQW-LEDs) hold tremendous potential for next-generation display and lighting applications, owing to their high color purity, excellent efficiency, and low fabrication cost. However, efficiency roll-off at high current density makes it challenging to achieve high brightness and long lifetime. Here, we designed CdSe/ZnSe/ZnS core/shell/shell CQWs with near-unity photoluminescence quantum yield. The graded heterostructure promotes carrier injection, and the bottom-emission device based on CdSe/ZnSe/ZnS CQWs exhibits remarkably suppressed efficiency roll-off with a record-high J₉₀ (current density for EQE to decrease to 90%) of 485 mA/cm² and a long operational lifetime (T₉₅ @ 100 cd/m²) over 47000 h. In addition, the top-emission device also shows low efficiency roll-off and high current efficiency of 36.5 cd/A. This study provides a compositionally graded approach to suppress efficiency roll-off in CQW-LEDs, demonstrating the strong potential of the newly developed CQWs for next-generation ultrabright and highly efficient optoelectronic devices.

Palabras clave:

pozos cuánticos coloidales eficiencia de corriente caída de eficiencia capa degradada diodos emisores de luz

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