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1. 商洛学院 化学工程与现代材料学院, 陕西 商洛 726000
2. 南昌大学 材料科学与工程学院, 江西 南昌 330031
3. 南昌大学 国家硅基LED工程技术研究中心,江西 南昌,330047
4. 安徽工业大学 数理科学与工程学院,安徽 马鞍山,243032
纸质出版日期:2019-7-5,
网络出版日期:2018-11-5,
收稿日期:2018-7-25,
修回日期:2018-10-17,
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杨超普, 方文卿, 毛清华等. InGaN/GaN多量子阱蓝光LED外延片的变温光致发光谱[J]. 发光学报, 2019,40(7): 891-897
YANG Chao-pu, FANG Wen-qing, MAO Qing-hua etc. Temperature-dependent Photoluminescence Spectra of InGaN/GaN Multiple Quantum Wells Blue LED Wafers[J]. Chinese Journal of Luminescence, 2019,40(7): 891-897
杨超普, 方文卿, 毛清华等. InGaN/GaN多量子阱蓝光LED外延片的变温光致发光谱[J]. 发光学报, 2019,40(7): 891-897 DOI: 10.3788/fgxb20194007.0891.
YANG Chao-pu, FANG Wen-qing, MAO Qing-hua etc. Temperature-dependent Photoluminescence Spectra of InGaN/GaN Multiple Quantum Wells Blue LED Wafers[J]. Chinese Journal of Luminescence, 2019,40(7): 891-897 DOI: 10.3788/fgxb20194007.0891.
利用MOCVD在Al
2
O
3
(0001)衬底上制备InGaN/GaN MQW结构蓝光LED外延片。以400 mW中心波长405 nm半导体激光器作为激发光源,采用自主搭建的100~330 K低温PL谱测量装置,以及350~610 K高温PL测量装置,测量不同温度下PL谱。通过Gaussian分峰拟合研究了InGaN/GaN MQW主发光峰、声子伴线峰、n-GaN黄带峰峰值能量、相对强度、FWHM在100~610 K范围的温度依赖性。研究结果表明:在100~330 K温度范围内,外延片主发光峰及其声子伴线峰值能量与FWHM温度依赖性,分别呈现S与W形变化;载流子的完全热化分布温度约为150 K,局域载流子从非热化到热化分布的转变温度为170~190 K;350~610 K高温范围内,InGaN/GaN MQW主发光峰峰值能量随温度变化满足Varshni经验公式,可在MOCVD外延生长掺In过程中,通过特意降温在线测PL谱,实时推算掺In量,在线监测外延片生长。以上结果可为外延片的PL发光机理研究、高温在线PL谱测量设备开发、掺In量的实时监测等提供参考。
A blue light LED epitaxial wafer with InGaN/GaN MQW structure was prepared on an Al
2
O
3
(0001) substrate by MOCVD. The 400 mW semiconductor laser with a center wavelength of 405 nm was used as the excitation light source. The PL-spectrum at different temperatures was measured by the self-built 100-330 K low-temperature PL spectrum measurement device and the 350-610 K high-temperature PL measurement device. The peak energy and the relative intensity of InGaN/GaN MQW main luminescence peak
the phonon concomitant peak and the n-GaN yellow band peak
as well as the temperature dependence of the FWHM in the range of 100-610 K were studied by Gaussian peak differentiating and imitating. The results showed that in the temperature range of 100-330 K
the peak energy of the main luminescence peak and the phonon concomitant peak of the epitaxial wafer
as well as the temperature dependence of the FWHM displayed S and W-shaped changes respectively; the complete heating distribution temperature of the carrier was about 150 K; the transition temperature of local carriers from non-heating to heating distribution was 170-190 K; in the high temperature ranged 350-610 K
the changes in peak energy of InGaN/GaN MQW with temperature variation satisfied the Varshni empirical formula. In the In-doped process of MOCVD epitaxial growth
the PL spectrum could be measured by deliberately cooling the temperature; the amount of In-doped was calculated in real time; and the epitaxial wafer growth was monitored online. The above results can be used for the study of PL luminescence mechanism of epitaxial wafers
development of high-temperature online PL spectrum measurement equipment
real-time monitoring of In-doped and so on.
GaN多量子阱发光二极管外延光致发光
GaNMQWLEDepitaxialphotoluminesecence
刘诗涛,王立,伍菲菲,等. InGaN/GaN多量子阱LED载流子泄漏与温度关系研究[J]. 发光学报, 2017,38(1):63-69. LIU S T,WANG L,WU F F, et al.. Temperature-dependent carrier leakage in InGaN/GaN multiple quantum wells light-emitting diodes[J]. Chin. J. Lumin., 2017,38(1):63-69. (in Chinese)
HATTORI A N,HATTORI K,MORIWAKI Y, et al.. Enhancement of photoluminescence efficiency from GaN(0001) by surface treatments[J]. Jpn. J. Appl. Phys., 2014,53(2):021001-1-5.
杨超普. MOCVD在线光致发光与红外测温研究[D]. 南昌:南昌大学, 2014. YANG C P. Research on MOCVD in situ Photoluminescence and On-line Infrared Thermometry [D]. Nanchang:Nanchang University, 2014. (in Chinese)
张凯. InGaN/GaN多量子阱发光特性的研究[D]. 济南:山东大学, 2015. ZHANG K. Optical Investigation on InGaN/GaN Multiple Quantum Wells [D]. Jinan:Shandong University, 2015. (in Chinese)
LIU S T,QUAN Z J,WANG L. Carrier transport via V-shaped pits in InGaN/GaN MQW solar cells[J]. Chin. Phys. B, 2017,26(3):038104-1-6.
YANG C P,FANG W Q,MAO Q H, et al.. Photoluminescence study of blue light LED epitaxial wafer during growth by MOCVD[J]. Optoelectron. Adv. Mater.-Rapid Commun., 2015,9(11-12):1575-1578.
王雪蓉,魏莉萍,郑会保,等. 利用光致发光法测定Al x Ga1-x N外延膜中的铝元素含量[J]. 激光与光电子学进展, 2012,49(5):051601-1-5. WANG X R,WEI L P,ZHENG H B, et al.. Al contents of Al x Ga1-x N epitaxial films studied by photoluminescence technique[J]. Laser Optoelectron. Prog., 2012,49(5):051601-1-5. (in Chinese)
魏国华,王斌,李俊梅,等. In0.2Ga0.8As/GaAs单量子阱PL谱温度特性及其机制[J]. 发光学报, 2010,31(5):619-623. WEI G H,WANG B,LI J M, et al.. Temperature dependence of the photoluminescence properties and the research on the mechanism of In0.2Ga0.8As/GaAs single quantum well[J]. Chin. J. Lumin., 2010,31(5):619-623. (in Chinese)
邢兵,曹文彧,杜为民. 不同In含量InGaN/GaN量子阱材料的变温PL谱[J]. 发光学报, 2010,31(6):864-869. XING B,CAO W Y,DU W M. Temperature-dependent PL of InGaN/GaN multiple quantum wells with variable content of In[J]. Chin. J. Lumin., 2010,31(6):864-869. (in Chinese)
LIN T,QIU Z R,YANG J R, et al.. Investigation of photoluminescence dynamics in InGaN/GaN multiple quantum wells[J]. Mater. Lett., 2016,173:170-173.
王绘凝. InGaN/GaN多量子阱的结构及其光学特性的研究[D]. 济南:山东大学, 2014. WANG H N. Structure and Optical Investigation on InGaN/GaN Multiple Quantum Wells [D]. Jinan:Shandong University, 2014. (in Chinese)
竹有章,傅关新,王红霞,等. HVPE生长GaN厚膜光致发光特性研究[J]. 激光与光电子学进展, 2011,48(9):093101-1-5. ZHU Y Z,FU G X,WANG H X, et al.. Luminescence of GaN thick film grown by HVPE[J]. Laser Optoelectron. Prog., 2011,48(9):093101-1-5. (in Chinese)
WANG Q,ZHU C R,ZHOU Y F, et al.. Fabrication and photoluminescence of strong phase-separated InGaN based nanopillar LEDs[J]. Superlattices Microstruct., 2015,88:323-329.
PRALL C,RUEBESAM M,WEBER C, et al.. Photoluminescence from GaN layers at high temperatures as a candidate for in situ monitoring in MOVPE[J]. J. Cryst. Growth, 2014,397:24-28.
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