Thermal assisted up-conversion electroluminescence in quantum dot light emitting diodes

Su，Qiang1; Chen，Shuming1,2

2022-12-01

10.1038/s41467-022-28037-w

Nature Communications   影响因子和分区

2041-1723

Up-conversion electroluminescence, in which the energy of a emitted photon is higher than that of the excitation electron, is observed in quantum-dot light-emitting diodes. Here, we study its mechanism by investigating the effect of thermal energy on the charge injection dynamic. Based on the results of temperature-dependent electroluminescence and theoretical analysis, we reveal that at sub-bandgap voltage, holes can be successfully injected into quantum-dots via thermal-assisted thermionic-emission mechanism, thereby enabling the sub-bandgap turn-on and up-conversion electroluminescence of the devices. Further theoretical deduction and experimental results confirm that thermal-assisted hole-injection is the universal mechanism responsible for the up-conversion electroluminescence. This work uncovers the charge injection process and unlocks the sub-bandgap turn-on mechanism, which paves the road for the development of up-conversion devices with power conversion efficiency over 100%.

SCI

英语

NI期刊 ; NI论文 ; ESI高被引

第一 ; 通讯

WOS:000744122300015

2-s2.0-85123105003

Scopus

1.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Key Laboratory of Energy Conversion and Storage Technologies (Southern University of Science and Technology),Ministry of Education,Shenzhen,518055,China

Su，Qiang,Chen，Shuming. Thermal assisted up-conversion electroluminescence in quantum dot light emitting diodes[J]. Nature Communications,2022,13(1).

Su，Qiang,&Chen，Shuming.(2022).Thermal assisted up-conversion electroluminescence in quantum dot light emitting diodes.Nature Communications,13(1).

Su，Qiang,et al."Thermal assisted up-conversion electroluminescence in quantum dot light emitting diodes".Nature Communications 13.1(2022).