TY  - JOUR
AU  - Mikulics, M.
AU  - Kordoš, P.
AU  - Gregušová, D.
AU  - Sofer, Z.
AU  - Winden, A.
AU  - Trellenkamp, Stefan
AU  - Moers, Jürgen
AU  - Mayer, Joachim
AU  - Hardtdegen, H.
TI  - Conditioning nano-LEDs in arrays by laser-micro-annealing: The key to their performance improvement
JO  - Applied physics letters
VL  - 118
IS  - 4
SN  - 1077-3118
CY  - Melville, NY
PB  - American Inst. of Physics
M1  - FZJ-2021-00880
SP  - 043101 -
PY  - 2021
AB  - A local so-called laser-micro-annealing (LMA) conditioning technology, which is suitable for the fabrication of a large range of hybrid nano-optoelectronic devices, was applied to III-nitride-based nano-light emitting diodes (LEDs). The LEDs with a diameter of ∼100 nm were fabricated in large area arrays and designed for hybrid optoelectronic applications. The LMA process was developed for the precise local conditioning of LED nano-structures. Photoluminescence measurements reveal the enhancement of nano-LED properties, which is in very good agreement with a simple model introduced based on the reduction of the defect layer depth by the LMA process. The experimental data confirm the reduction of the defect layer depth from ∼17 nm to ∼5 nm determined. In consequence, an increase in work currents up to 40 nA at 5 V bias after the LMA procedure as well as high electroluminescence (EL) and output optical power up to 150 nW in the ∼440–445 nm emission wavelength range corresponding to ∼75% wall-plug efficiency were achieved. Additionally, the LEDs' electroluminescence intensities reach the desired values by conditioning the contact/annealed regions of individual LEDs accordingly. Furthermore, the LMA process affects the long-term stability of the electroluminescence (EL) intensity of single nano-LED devices. A study of the EL during 5000 h in the continuous wave operation testing mode revealed a moderate ∼15% decrease in the intensity in comparison to ∼50% for their non-LMA counterparts. Finally, Raman measurements indicate that the “work” temperature for nano-LED conditioned structures decreases.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000630480400001
DO  - DOI:10.1063/5.0038070
UR  - https://juser.fz-juelich.de/record/890300
ER  -