Improving light extraction in light-emitting diodes using zinc-tin-oxide layers

In this study, we report on the synthesis and applications of zinc-tin-oxide (ZTO) as a light extraction layer for GaN-based light-emitting diodes (LED). The ZTO layers formed on top of an LED epi-structure with a variable Sn-ratio, which was deposited by the spin coating method. The transmission sp...

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Bibliographic Details
Published in:Journal of alloys and compounds 2017-07, Vol.710, p.399-402
Main Authors: Kim, T.G., Shin, D.S., Jung, K.-Y., Kadam, A.N., Park, J.
Format: Article
Language:English
Subjects:
Chemical compounds
Electroluminescence
Extraction
Gallium nitrides
Light emitting diodes
Light extraction
Light-emitting diode
Luminescence
Organic light emitting diodes
Refractivity
Spin coating
Tin
Zinc oxide
ZTO
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Summary:In this study, we report on the synthesis and applications of zinc-tin-oxide (ZTO) as a light extraction layer for GaN-based light-emitting diodes (LED). The ZTO layers formed on top of an LED epi-structure with a variable Sn-ratio, which was deposited by the spin coating method. The transmission spectra of the ZTO layers with Zn to Sn ratios of 1:1 (ZTO-I) and 1:5 (ZTO-II) exhibited optical transmittances of 98% and 88% in the visible region, respectively. The electroluminescence (EL) and light power-current-voltage (L-I-V) measurements show that double ZTO layers consisting of various Zn to Sn ratios led to enhanced light extraction from blue LEDs. The improvement of light extraction in the LEDs can be attributed to the gradually reduced refractive index of the ZTO layers, which enlarges the photon escape cone and minimizes the Fresnel refraction loss at the interface between air and GaN. •Improved light extraction in GaN-based LEDs via the spin-coated ZTO nanoparticles.•A gradual change in the refractive index of ZTO by controlling the ratio of Zn:Sn.•ZTO double layers with gradually changed refractive index improved light extraction.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.03.270