Investigation and Comparison of the GaN-Based Light-Emitting Diodes Grown on High Aspect Ratio Nano-Cone and General Micro-Cone Patterned Sapphire Substrate

Huang, Jhih-Kai; Lin, Da-Wei; Shih, Min‐Hsiung; Lee, Kang-Yuan; Chen, Jyun-Rong; Huang, H. W.; Kuo, Shou‐Yi; Lin, Chien-Chung; Lee, Po-Tsung; Chi, Gou–Chung; Kuo, Hao‐Chung

doi:10.1109/jdt.2013.2270276

Cited by 17 publications

(2 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Kuo's study also showed the same tendency in reducing the dislocation density of GaN grown on NPSS with a reduction of 27% as compared with GaN grown on MPSS. [18] Nonetheless, some simulated results indicated that the LEE enhancement might be decreased with the period of the patterns decreased. [19] It means there is probable some loss in LEE while the NPSS is adopted, although the performance of NPSS-LED is sometimes better than that of MPSS-LED.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a hierarchical patterned sapphire substrate for GaN-based light-emitting diodes

Zha

et al. 2023

International Conference on Optical Technology, Semiconductor Materials, and Devices (OTSMD 2022)

View full text Add to dashboard Cite

Microscale or nanoscale patterns with specific structures on sapphire substrate can effectively reduce the dislocation defects of gallium nitride (GaN) material and improve the quality of gallium nitride crystal during the epitaxy growth of GaN-based light-emitting diodes, thus improving the internal quantum efficiency of LED luminescence. Numbers of methods have been used to fabricated patterned sapphire substrate. But most methods remain on the micron scale. In this work, the nickel annealing technique was introduced to fabricate a novel sapphire substrate, hierarchical patterned sapphire substrate (HPSS), which has typical characteristics of nano sapphire pillars on a micro-patterned sapphire substrate (MPSS) used for GaN-based light-emitting diodes (LEDs). Nano-pillars with an average feature size of about 110 nm and feature surface density of >2.339×10 9 cm -2 were obtained on commercial MPSS through this method. This nickel annealing technique provides an extremely simple, cost-effective and universal method to fabricate hierarchical patterns with 2-inch wafer-scale. What's more, the substrates can be not only sapphire but also extended to silicon, quartz and other heat-resisting materials which are widely used in photoelectric devices and micro/nanofabrication, making it a promising method to fabricate patterned substrate for industrial applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Fabrication of a hierarchical patterned sapphire substrate for GaN-based light-emitting diodes

Zha

et al. 2023

International Conference on Optical Technology, Semiconductor Materials, and Devices (OTSMD 2022)

View full text Add to dashboard Cite

show abstract

“…Recent theoretical and experimental studies 7,8 have suggested that greater light output power (LOP) may be achieved for GaN-based LEDs when nanopatterned sapphire substrates (NPSSs) are used rather than micropatterned sapphire substrates (MPSSs). Recent theoretical and experimental studies 7,8 have suggested that greater light output power (LOP) may be achieved for GaN-based LEDs when nanopatterned sapphire substrates (NPSSs) are used rather than micropatterned sapphire substrates (MPSSs).…”

Section: Introductionmentioning

confidence: 99%

Fabrication of wafer-scale nanopatterned sapphire substrate by hybrid nanoimprint lithography

Guo

Zhuang

et al. 2014

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

View full text Add to dashboard Cite

show abstract

Improving the Light Quality of White Light‐Emitting Diodes Using Cellulose Nanocrystal‐Filled Phosphors

Chowdhury

Wang

2021

Advanced Photonics Research

View full text Add to dashboard Cite

Light‐emitting diode (LED) lighting delivers better performance and reliability, and substantially lowers the total cost of ownership compared with conventional lighting. The most common white LED is generally produced using a blue LED chip and phosphor combination to generate white light. This type of phosphor‐converted white LED can be a great alternative to the more expensive 3 chip RGB (red, green, blue) LED. Herein, cellulose nanocrystals, a wood‐derived biopolymer, are used with phosphor to improve the uniformity of correlated color temperature (CCT) and luminous flux from the white LED. These nanocrystals can scatter light strongly and for an optimized concentration of nanocrystals, it is found to increase the luminous flux of the white LED by over 30% compared with the reference sample without any nanocrystal. The CCT uniformity is also improved from 173.45 K for the reference sample to 59 K for the optimized sample. The chromaticity coordinates are also studied and found to be shifting toward lower correlated color temperatures with increasing cellulose concentrations. Combining these results with low cost, wide availability, and environmental impact, cellulose nanocrystals can play an important role in the future generation of white LEDs.

show abstract

Investigation and Comparison of the GaN-Based Light-Emitting Diodes Grown on High Aspect Ratio Nano-Cone and General Micro-Cone Patterned Sapphire Substrate

Cited by 17 publications

References 26 publications

Fabrication of a hierarchical patterned sapphire substrate for GaN-based light-emitting diodes

Fabrication of a hierarchical patterned sapphire substrate for GaN-based light-emitting diodes

Fabrication of wafer-scale nanopatterned sapphire substrate by hybrid nanoimprint lithography

Improving the Light Quality of White Light‐Emitting Diodes Using Cellulose Nanocrystal‐Filled Phosphors

Contact Info

Product

Resources

About