Fabrication and Characterization of GaN-based White LED on 4-inch Patterned Sapphire Substrate

You-hua ZHU; Xuan LIU; Mei-yu WANG; Yi LI

doi:10.37188/fgxb20204107.0858

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Fabrication and Characterization of GaN-based White LED on 4-inch Patterned Sapphire Substrate

Device Fabrication and Physics | 更新时间：2020-09-10

- Fabrication and Characterization of GaN-based White LED on 4-inch Patterned Sapphire Substrate
- Chinese Journal of Luminescence Vol. 41, Issue 7, Pages: 858-862(2020)
- 作者机构：
  
  南通大学信息科学技术学院, 江苏南通 226019
- 作者简介：
  
  ZHU You-hua, E-mail:ntyouhua@ntu.edu.cn
- 基金信息：
  
  Supported by National Natural Science Foundation of China;Industry-University-Resear
- DOI：10.37188/fgxb20204107.0858
  CLC： TN312.8
- Received：29 April 2020，
  
  Accepted：13 May 2020，
  
  Published：2020-07
- 稿件说明：
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You-hua ZHU, Xuan LIU, Mei-yu WANG, et al. Fabrication and Characterization of GaN-based White LED on 4-inch Patterned Sapphire Substrate[J]. Chinese journal of luminescence, 2020, 41(7): 858-862.
DOI：

You-hua ZHU, Xuan LIU, Mei-yu WANG, et al. Fabrication and Characterization of GaN-based White LED on 4-inch Patterned Sapphire Substrate[J]. Chinese journal of luminescence, 2020, 41(7): 858-862. DOI： 10.37188/fgxb20204107.0858.

摘要

在4-inch蓝宝石图形衬底上，基于InGaN/GaN多量子阱结构制备了蓝光LED芯片，并通过与钇铝石榴石黄色荧光粉（YAG：Ce

）结合，封装成白光LED器件。简要介绍了外延生长和芯片工艺及封装流程，并对材料特性及器件性能进行了表征。外延片表面形貌良好，蓝光外延片荧光光谱（PL）显示峰值波长为442 nm。对封装后白光芯片进行电学特性测试，得出其开启与限流电压分别为2.7 V与3.6 V。此外，电致发光光谱（EL）含有两个主要的发光峰，分别是440 nm的蓝光峰以及540 nm的黄绿光峰，而随着注入电流的增加，蓝光峰位先蓝移后红移，黄绿光峰位先红移后蓝移再红移。本文中相关的芯片制备及表征技术将对固态照明研究起到一定的促进作用。

Abstract

A blue light emitting diode(LED) chip has been fabricated on a 4-inch patterned sapphire substrate with an InGaN/GaN multiple quantum well structure. It has also been combined with a yttrium aluminum garnet yellow phosphor(YAG:Ce

) to be packaged into a white LED device. In this study

its epitaxial growth

chip process and packaging process have been briefly described. Some material property and device performance have been characterized. The surface of the epitaxial wafer has a good morphology. The photoluminescence(PL) spectrum of the blue epitaxial wafer shows a peak wavelength of 442 nm. Basing on the electrical characteristics of the packaged white light chip

the threshold and current-limit voltages are 2.7 V and 3.6 V

respectively. In addition

the electroluminescence(EL) spectra contain two main peaks with one at 440 nm of blue light and the other one at 540 nm of yellow-green light. With the increase of the injection current

the blue peak varies from blue-shift to red-shift

and the yellow-green varies from red-shift to blue-shift and then red-shift. It is believed that the related chip fabrication and characterization technology would play a certain role in the research for promoting on solid-state lighting field.

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