High-Speed GaN-Based Blue Light-Emitting Diodes With Gallium-Doped ZnO Current Spreading Layer

Liao, Chien-Lan; Chang, Yu-Teng; Ho, Chong-Lung; Wu, Meng–Chyi

doi:10.1109/led.2013.2252457

Cited by 92 publications

(36 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Till now, various methods have been proposed to improve the modulation bandwidth of LEDs in terms of reducing the RC time constant, such as decreasing the thickness of the active layer [7], using barrier-doped MQWs structure [6][7][8], and decreasing the effective active area [6,9]. However, once the size of LEDs reaches the limit, the RC time constant cannot be further decreased.…”

mentioning

confidence: 99%

Design of GaN‐based surface plasmon LEDs to enhance the modulation bandwidth and light output

Liu

Zhao

Zhu

et al. 2015

Phys. Status Solidi C

View full text Add to dashboard Cite

Gallium nitride based light emitting diodes have shown their advantages in the application of visible light communication (VLC) besides general illumination. However, the modulation bandwidth of current commercial GaN based LEDs still cannot meet daily application of VLC. It has been reported that the modulation bandwidth can be enhanced by the surface plasmon due to the coupling between the surface plasmon and the active region of LEDs. However, the light output may be decreased. In this study, we designed a GaN‐based surface plasmon LEDs using lateral coupling to both increase the light output and the modulation bandwidth. The finite difference time domain method was utilized to investigate the modulation bandwidth of the GaN‐based surface plasmon LEDs as well as the light output. Simulation results show that the modulation bandwidth was estimated to be ∼2.3 GHz with 2.5 times enhancement of the light output compared with conventional LED structure. This design of surface plasmon LEDs will be useful for applications in high frequency visible light communication. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract

mentioning

confidence: 99%

Design of GaN‐based surface plasmon LEDs to enhance the modulation bandwidth and light output

Liu

Zhao

Zhu

et al. 2015

Phys. Status Solidi C

View full text Add to dashboard Cite

show abstract

“…sinyal yang dikirimkan hanyalah sinyal biasa yang belum terlalu kompleks. Diketahui dari beberapa penelitian teknologi Visible Light Communication (VLC) harus memperhatikan penggunaan LED dan photodiode yang sesuai dengan sinyal informasinya (Liao, Chang, Ho, & Wu, 2013) dan dapat menggunakan beberapa metoda dalam aplikasinya (Bykhovsky & Arnon, 2014) (Chang et al, 2014) (Monteiro & Hranilovic, 2014) (Singh, O'Farrell, & David, 2014) (Wu et al, 2015). Serta dari beberapa penelitian lainnya didapatkan hasil yang mendukung pemanfaatan VLC sebagai teknologi masa depan yang patut diteliti lebih lanjut (Darlis, Cahyadi, & Chung, 2018) (Hanzo et al, 2012) (Liu, Yeh, & Chow, 2013).…”

Section: Pendahuluanunclassified

Color Filter Identification for Bidirectional Visible Light Communication

2018

View full text Add to dashboard Cite

ABSTRAKSaat ini, cahaya tampak dimanfaatkan oleh manusia hanya sebagai penerangan saja. Akan tetapi, beberapa penelitian telah membuktikan bahwa cahaya tampak dapat dimanfaatkan pula pada sistem komunikasi, yang dinamakan Visible Light Communication (VLC). Pada penelitian ini, sebuah metoda menggunakan color filter diidentifikasi dalam mengimplementasikan sistem bidirectional pada teknologi VLC. Dengan adanya penelitian ini, sebuah sistem bidirectional Visible Light Communication (Bi-VLC) dapat diimplementasikan dengan menggunakan color filter tertentu yang dipasangkan pada posisi uplink dan downlink. Sinyal informasi berupa sinyal audio ditansmisikan melalui VLC transmitter (Tx) yang dipasang color filter dan diterima oleh color filter pada VLC receiver (Rx) setelah melalui media cahaya. Pengujian menunjukan bahwa sistem telah dapat melewatkan sinyal pada frekuensi audio dengan jarak maksimum dari sistem adalah 2,3 m. Sedangkan pasangan color filter yang memiliki kinerja paling baik untuk BI-VLC adalah Azure (Tx) dengan Charteuse Green (Rx), Charteuse Green (Tx) dengan Charteuse Green (Rx), dan Rose (Tx) dengan Charteuse Green (Rx).Kata kunci: Bidirectional, Visible Light Communication (VLC), Color Filter, Audio ABSTRACT Currently, visible light are utilized by humans as illumination only. However, several research have proven that visible light can also be used in communication systems, called Visible Light Communication (VLC). In this research, a method of using color filters was identified for bidirectional systems on VLC technology. With this research, a bidirectional Visible Light Communication (Bi-VLC) system can be implemented using a specific color filter paired in uplink and downlink mode. The audio signal as information is transmitted through a VLC transmitter (Tx) installed by a color filter and received by the color filter on the VLC receiver (Rx) after going through the light media. The result shows that the system has been able to pass the signal at the audio frequency with the maximum distance of the system is 2.3 m. While the best performance of color filter pair for BI-VLC is Azure (Tx) with Charteuse Green (Rx), Charteuse Green (Tx) with Charteuse Green (Rx), and Rose (Tx) with Charteuse Green (Rx).

show abstract

“…Semiconductor metal oxides, such as ZnO, SnO 2 and In 2 O 3 , are commonly applied in resistive gas sensors, exploiting the variations in the electrical conductivity of these materials upon exposure to gaseous mixtures [1][2][3][4][5]. In the last years, nanostructured zinc oxide is receiving a large amount of attention in device production because of its dominant chemical and physical properties and morphology variations.…”

Section: Introductionmentioning

confidence: 99%

Growth, characterization, and investigation of H2 gas sensing performance of Al-doped ZnO thin films synthesized by plasma focus device

Hosseinnejad

Ghoranneviss

Hantehzadeh

et al. 2016

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

This paper reports characterization of Al-doped ZnO (AZO) thin films deposited on glass substrates at room temperature by a low energy (1.3 kJ) plasma focus device using a ZnO target with an Al content of 3wt%. A particular focus of investigation is on properties relevant to the usage of thin films as hydrogen gas sensors. Indeed, the dependence of angular position of substrate on structural, morphological and gas sensing properties of AZO thin films is investigated. The results obtained from X-ray diffraction (XRD) reveal that all the films are of polycrystalline zinc oxide in nature, possessing hexagonal wurtzite structure. Also XRD results indicate strong dependence of crystallinity of deposited thin films on angular position of samples. Scanning electron microscopy and atomic force microscopy results reveal the structure growth and enhancement of surface roughness with decreasing the angle with respect to anode axis. The experiments and measurements involving the AZO deposited thin films towards hydrogen were carried out at different operating temperatures within 150-400°C for various concentrations of hydrogen in air. The H 2 sensing response enhanced with concentration and operating temperature, and reached its maximum at 300°C to 1000 ppm concentration of hydrogen gas. The results also indicated shorter response times for samples deposited at larger angular positions.

show abstract

High-Speed GaN-Based Blue Light-Emitting Diodes With Gallium-Doped ZnO Current Spreading Layer

Cited by 92 publications

References 14 publications

Design of GaN‐based surface plasmon LEDs to enhance the modulation bandwidth and light output

Design of GaN‐based surface plasmon LEDs to enhance the modulation bandwidth and light output

Color Filter Identification for Bidirectional Visible Light Communication

Growth, characterization, and investigation of H2 gas sensing performance of Al-doped ZnO thin films synthesized by plasma focus device

Contact Info

Product

Resources

About