DataVXACS Applied Materials & InterfacesPaper
journal article·2015-12-23

Visible Color Tunable Emission in Three-Dimensional Light Emitting Diodes by MgO Passivation of Pyramid Tip

Ji-Hyun Kim, Byeong Uk Ye, Joonmo Park, Chul Jong Yoo, Buem Joon Kim, Hu Young Jeong, Jin-Hoe Hur, Jong Kyu Kim, Jong-Lam Lee, Jeong Min Baik

ACS Applied Materials & Interfaces· Volume 7· Issue 50
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Source abstract

Abstract

We demonstrated visible color tunable three-dimensional (3D) pyramidal light emitting diodes by depositing the MgO on and near the tip of the pyramid as an insulating layer. Here, we show that the degradation of the materials (i.e., p-GaN) crystallinity and the built-in electric field due to the nanoscale geometry of the tip region is responsible for the large leakage current observed in LEDs. Confocal scanning electroluminescence microscopy images clearly showed that the intensity of the light emitted out of the side facet of the pyramid is much higher than that of the light extracted out of the tip surface, indicating that the MgO layer prohibited the carrier injection to the MQWs layer, suppressing the leakage occurring at or near the tip region of the pyramids. The color range of the LEDs can be also tuned by using the MgO layer, a blue-shift by 10.3 nm in the wavelength. This technique is simple and scalable, providing a promising solution for developing 3D pyramidal LEDs with low leakage current and controllable light emission.
Source: openalex_inverted_index · Quality: baseline

Research context

Nanomaterials

OpenAlex topics: GaN-based semiconductor devices and materials · ZnO doping and properties · Ga2O3 and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science Engineering, KIST-UNIST-Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea

Department of Materials Science and Engineering, Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk 790-784, Republic of Korea

UNIST Central Research Facilities (UCRF), Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Korea

UNIST-OLYMPUS BIOMED IMAGING CENTER(UOBC), Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea

Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk 790-784, Republic of Korea

Funding

Ulsan National Institute of Science and Technology · National Research Foundation of Korea

References (26)

Show source-provided references
1. 10.1038/nphoton.2009.3210.1038/nphoton.2009.32 ↗
2. 10.1002/adfm.20110198710.1002/adfm.201101987 ↗
3. 10.1002/pssa.20102614910.1002/pssa.201026149 ↗
4. 10.1002/1521-396X(200111)188:1<15::AID-PSSA15>3.0.CO;2-510.1002/1521-396X(200111)188:1<15::AID-PSSA15>3.0.CO;2-5 ↗
5. 10.1063/1.308105910.1063/1.3081059 ↗
6. 10.1038/nmat172610.1038/nmat1726 ↗
7. 10.1002/adma.20110253410.1002/adma.201102534 ↗
8. 10.1021/nl200810v10.1021/nl200810v ↗
9. 10.1038/nphoton.2011.25310.1038/nphoton.2011.253 ↗
10. 10.1021/nl402104510.1021/nl4021045 ↗
11. 10.1002/pssb.20104635210.1002/pssb.201046352 ↗
12. 10.1002/adma.20110080610.1002/adma.201100806 ↗
13. 10.1149/2.018202esl10.1149/2.018202esl ↗
14. 10.1039/c2jm34405j10.1039/c2jm34405j ↗
15. 10.1063/1.176323410.1063/1.1763234 ↗
16. 10.1063/1.235793010.1063/1.2357930 ↗
17. 10.1063/1.481223110.1063/1.4812231 ↗
18. 10.1063/1.366810410.1063/1.3668104 ↗
19. 10.1039/c3tc32212b10.1039/c3tc32212b ↗
20. 10.1063/1.176323410.1063/1.1763234 ↗
21. 10.1002/adma.20130568410.1002/adma.201305684 ↗
22. 10.1038/srep0551410.1038/srep05514 ↗
23. 10.1063/1.12644810.1063/1.126448 ↗
24. 10.1063/1.346699810.1063/1.3466998 ↗
25. 10.1364/OE.21.02303010.1364/OE.21.023030 ↗
26. 10.1016/j.sse.2013.10.00910.1016/j.sse.2013.10.009 ↗