Journal
ISCIENCE
Volume 23, Issue 6, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.isci.2020.101210
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Funding
- National Natural Science Foundation of China [11674018]
- Beijing Nova Program [Z171100001117101]
- Young Talent Program of the Beijing Municipal Commission of Education
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Here we demonstrate a novel and robust mechanism, termed as current-induced Joule heating activated thermal tunneling excitation, to achieve electroluminescence (EL) by the hot electron-hole-pair recombination in a single highly compensated semiconductor microrod. The radiative luminescence is electrically excited under ambient conditions. The current-induced Joule heating reduces the thermal tunneling excitation threshold of voltage down to 8 V and increases the EL efficiency similar to 4.4-fold at 723 K. We interpret this novel phenomenon by a thermal tunneling excitation model corrected by electric-induced Joule heating effect. The mechanism is confirmed via theoretical calculation and experimental demonstration, for the first time. The color-tunable EL emission is also achieved by regulation of donor concentration. This work opens up new opportunities for design of novel multi-color light-emitting devices by homogeneous defect-engineered semiconductors in future.
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