Details
| Original language | English |
|---|---|
| Article number | 836 |
| Journal | Nanomaterials |
| Volume | 11 |
| Issue number | 4 |
| Publication status | Published - 2021 |
| Externally published | Yes |
Abstract
Besides high-power light-emitting diodes (LEDs) with dimensions in the range of mm, micro-LEDs (µLEDs) are increasingly gaining interest today, motivated by the future applications of µLEDs in augmented reality displays or for nanometrology and sensor technology. A key aspect of this miniaturization is the influence of the structure size on the electrical and optical properties of µLEDs. Thus, in this article, investigations of the size dependence of the electro-optical properties of µLEDs, with diameters in the range of 20 to 0.65 µm, by current–voltage and electroluminescence measurements are described. The measurements indicated that with decreasing size leakage currents in the forward direction decrease. To take advantage of these benefits, the surface has to be treated properly, as otherwise sidewall damages induced by dry etching will impair the optical properties. A possible countermeasure is surface treatment with a potassium hydroxide based solution that can reduce such defects.
Keywords
- Efficiency, Electroluminescence, GaN, Size effect, µLED
ASJC Scopus subject areas
- Chemical Engineering(all)
- General Chemical Engineering
- Materials Science(all)
- General Materials Science
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In: Nanomaterials, Vol. 11, No. 4, 836, 2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Size-dependent electroluminescence and current-voltage measurements of blue ingan/gan µleds down to the submicron scale
AU - Wolter, Stefan
AU - Spende, Hendrik
AU - Gülink, Jan
AU - Hartmann, Jana
AU - Wehmann, Hergo Heinrich
AU - Waag, Andreas
AU - Lex, Andreas
AU - Avramescu, Adrian
AU - Lugauer, Hans Jürgen
AU - von Malm, Norwin
AU - Drolet, Jean Jacques
AU - Strassburg, Martin
N1 - Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021
Y1 - 2021
N2 - Besides high-power light-emitting diodes (LEDs) with dimensions in the range of mm, micro-LEDs (µLEDs) are increasingly gaining interest today, motivated by the future applications of µLEDs in augmented reality displays or for nanometrology and sensor technology. A key aspect of this miniaturization is the influence of the structure size on the electrical and optical properties of µLEDs. Thus, in this article, investigations of the size dependence of the electro-optical properties of µLEDs, with diameters in the range of 20 to 0.65 µm, by current–voltage and electroluminescence measurements are described. The measurements indicated that with decreasing size leakage currents in the forward direction decrease. To take advantage of these benefits, the surface has to be treated properly, as otherwise sidewall damages induced by dry etching will impair the optical properties. A possible countermeasure is surface treatment with a potassium hydroxide based solution that can reduce such defects.
AB - Besides high-power light-emitting diodes (LEDs) with dimensions in the range of mm, micro-LEDs (µLEDs) are increasingly gaining interest today, motivated by the future applications of µLEDs in augmented reality displays or for nanometrology and sensor technology. A key aspect of this miniaturization is the influence of the structure size on the electrical and optical properties of µLEDs. Thus, in this article, investigations of the size dependence of the electro-optical properties of µLEDs, with diameters in the range of 20 to 0.65 µm, by current–voltage and electroluminescence measurements are described. The measurements indicated that with decreasing size leakage currents in the forward direction decrease. To take advantage of these benefits, the surface has to be treated properly, as otherwise sidewall damages induced by dry etching will impair the optical properties. A possible countermeasure is surface treatment with a potassium hydroxide based solution that can reduce such defects.
KW - Efficiency
KW - Electroluminescence
KW - GaN
KW - Size effect
KW - µLED
UR - http://www.scopus.com/inward/record.url?scp=85103064929&partnerID=8YFLogxK
U2 - 10.3390/nano11040836
DO - 10.3390/nano11040836
M3 - Article
AN - SCOPUS:85103064929
VL - 11
JO - Nanomaterials
JF - Nanomaterials
SN - 2079-4991
IS - 4
M1 - 836
ER -