|
|
|
|
|
|
| High Color Gamut Quantum Dots LED and Its Application Research in Backlight Display |
| WANG Guo, YANG Xin, LI Dong-ying, SUN Xin-yu, FANG Yi-xu, ZHANG Yong, SU Shi-chen* |
| South China Normal University, Institute of Optoelectronic Materials and Technology, Guangzhou 510631, China |
|
|
|
|
Abstract Quantum dots are widely used in the field of luminescence because of their unique and excellent optical properties. The most prominent feature is that the spectral tuning is convenient, and only the size of the material needs to be changed to realize the tuning of the luminescence spectrum. In combination with the needs of practical applications, CdSe materials were selected as the main research object. By improving the process, introducing Schlenk line to isolate water and oxygen, using high temperature thermal injection method, adjusting the ratio of cadmium source and zinc source, selenium source and sulfur source in raw materials, the core-shell structure CdSe/ZnS red and green quantum dot materials with high color purity and high efficiency and stability were obtained. The synthetic quantum dots have a size of about 6.0 and 4.2 nm, luminescence peaks of 625 nm and 525 nm, the full width at half maximum (FWHM) in PL spectra of 30 and 28 nm, and photoluminescence quantum yield (PLQY) of 82% and 61%, respectively. And then the application of quantum dot LED in backlight display was studied. The composite red and green quantum dot materials were used to replace the phosphor materials in the traditional process. By improving the packaging method, the quantum dot light conversion layer was protected by a double-layer epoxy resin AB glue, at the same time, a PMMA lens coating was introduced to fundamentally isolate water and oxygen. Finally, the packed quantum dot white light-emitting diodes(wLEDs) have red, green and blue emission peaks of 630, 535 and 453 nm, respectively. The FWHM of PL spectra are 20, 28 and 30 nm. The three-segment spectral emission peaks have good symmetry on both sides, effectively solving the problem that the LED is missing in the red spectral band of the traditional phosphorwLEDs. And it achieves the advantages of good monochromaticity, high color purity, and high color saturation. The quantum dot wLEDs with CIE color coordinate (0.329, 0.324) was obtained under the condition of 20 mA current in the LED integrating sphere photochromic test system. The color coordinate was very closed to the standard white light. Its color temperature was 5 094 K, the luminous efficiency reached 94.72 lm·w-1, and the color rendering index Ra could approach 78.6, and the lifetime was more than 400 h. Finally, the quantum dot LED strip was packaged to complete the backlight. According to the quantum dot wLEDs emission spectrum gained from the test, we could obtain the sRGB color triangle, ie the color gamut. By comparing the NTSC1931 standard color gamut, we discovered a high color gamut quantum dot LED backlight with a colorgamut coverage of 109.7%. The LED backlight developed was made up of 240 quantum dot wLEDs and successfully demonstrated the 29-inch LCD TV panel for the first time. This result will further develop tailor-made quantum dots, especially in high-performance display applications.
|
|
Received: 2019-03-14
Accepted: 2019-07-10
|
|
|
|
Corresponding Authors:
SU Shi-chen
E-mail: shichensu@scnu.edu.cn
|
|
[1] Li X, Wu Y, Zhang S, et al. Advanced Functional Materials, 2016, 26(15): 2435.
[2] Han Heyou, Sheng Zhonghai, Liang Jiangong, et al. Materials Letters, 2006, 60(29): 3782.
[3] Abe S, Joos J J, Martin L I, et al. Light Science & Applications, 2016, 6(6): e16271.
[4] Bauer C A, Hamada T Y, Kim H, et al. Journal of Chemical Education, 2018, 95(7): 1179.
[5] Owen J S, Brus L E. Chemical. Journal of the American Chemical Society, 2017, 139(32): 7b.
[6] Luo X, Hu R, Liu S, et al. Progress in Energy & Combustion Science, 2016, 56: 1.
[7] Nizamoglu S, Ozel T, Sari E, et al. Nanotechnology, 2007, 18(6): 160.
[8] Nakamura H, Yamaguchi Y, Miyazaki M, et al. Chemical Communications, 2002, 23(23): 2844.
[9] Landry M L, Morrell T E, Karagounis T K, et al. Journal of Chemical Education, 2014, 91(2): 274.
[10] Zhang Z, Ye Y, Pu C, et al. Advanced Materials, 2018, 30(28): e1801387.
[11] Shirasaki Y, Supran G J, Bawendi M G, et al. Nature Photonics, 2013, 7(1): 13.
[12] Sheu J K, Chang S J, Kuo C H, et al. IEEE Photonics Technology Letters, 2003, 15(1): 18.
[13] Eunjoo J, Shinae J, Hyosook J, et al. Advanced Materials, 2010, 22(28): 3076.
[14] Erdem T, Demir H V. Nanophotonics, 2013, 2(1): 57.
[15] Schreuder M A, Xiao K, Ivanov I N, et al. Nano Letters, 2010, 10(2): 573.
[16] Xuan T T, Liu J Q, Xie R J, et al. Chemistry of Materials, 2015, 27(4): 61207301.
[17] Kovalenko M V, Liberato M, Andreu C, et al. ACS Nano, 2018, 9(2): 1012.
[18] Xie B, Chen W, Hao J, et al. Optics Express, 2016, 24(26): A1560.
[19] Lin C C, Liu R S. Journal of Physical Chemistry Letters, 2011, 2(11): 1268.
[20] Shinae J, Eunjoo J. Angewandte Chemie, 2013, 52(2): 679.
[21] Polovitsyn A, Dang Z, Movilla J L, et al. Chemistry of Materials, 2017, 29(13): 7b. |
| [1] |
BAI Xi-lin1, 2, PENG Yue1, 2, ZHANG Xue-dong1, 2, GE Jing1, 2*. Ultrafast Dynamics of CdSe/ZnS Quantum Dots and Quantum
Dot-Acceptor Molecular Complexes[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(01): 56-61. |
| [2] |
YI Min-na1, 2, 3, CAO Hui-min1, 2, 3*, LI Shuang-na-si1, 2, 3, ZHANG Zhu-shan-ying1, 2, 3, ZHU Chun-nan1, 2, 3. A Novel Dual Emission Carbon Point Ratio Fluorescent Probe for Rapid Detection of Lead Ions[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3788-3793. |
| [3] |
LAI Niu, HUANG Qi-qiang, ZHANG Qin-yang, ZHANG Bo-wen, WANG Juan, YANG Jie, WANG Chong, YANG Yu, WANG Rong-fei*. Introduction to Perovskite Quantum Dots and Metal-Organic Frameworks and the Development of Composites[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(11): 3321-3329. |
| [4] |
HAN Zhao-xia1, 2, 3*, YANG Zhi-jin1, ZHANG Zhi-hong1, DING Shu-hui1, ZHANG Da-wei1, 2, 3, HONG Rui-jin1, 2, 3, TAO Chun-xian1, 2, 3, LIN Hui1, 2, 3, YU De-chao1, 2, 3. Preparation of Full-Color Carbon Quantum Dots and Their Application in WLED[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(05): 1358-1366. |
| [5] |
FENG Xiang-yu, JIANG Na, WANG Wei, LI Meng-qian, ZHAO Su-ling*, XU Zheng. One-Step Synthesis of Sulfur Quantum Dots and Electroluminescent Properties[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(05): 1569-1574. |
| [6] |
LI Shuai-wei1, WEI Qi1, QIU Xuan-bing1*, LI Chuan-liang1, LI Jie2, CHEN Ting-ting2. Research on Low-Cost Multi-Spectral Quantum Dots SARS-Cov-2 IgM and IgG Antibody Quantitative Device[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(04): 1012-1016. |
| [7] |
LÜ Chun-qiu1, SI Lu-lu1, PAN Zhao-jin2, LIANG Yang-lin1, LIAO Xiu-fen2, CHEN Cong-jin2*. Fast and Ratiometric Detection of Dimethoate Via the Dual- Emission Center Nitrogen-Doped Carbon Quantum Dots[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(02): 468-474. |
| [8] |
LIU Yu-ying1, 2, WANG Xi-yuan1, 2*, MEI Ao-xue1, 2. Green Preparation of Biomass Carbon Quantum Dots for Detection of Cu2+[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(01): 248-253. |
| [9] |
XU Yi-fei, LIU Lu, SHI Shi-kao*, WANG Yue, PAN Yu-jing, MA Xing-wei. Spectroscopic Properties of Carbon Quantum Dots Prepared From Persimmon Leaves and Fluorescent Probe to Fe3+ Ions[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(08): 2418-2422. |
| [10] |
FEI Xue-ning*, ZHENG Yuan-jie, GU Ying-chun, LI Guang-min, ZHAO Hong-bin, ZHANG Bao-lian. Fluorescence Imaging and Chiral Specific Biological Recognition[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(12): 3802-3807. |
| [11] |
WANG Su-hui, ZHANG Xu, SUN Zhi-shen, YANG Jie, GUO Teng-xiao*, DING Xue-quan*. Methods of Detecting Multiple Chemical Substances Based on Near-Infrared Colloidal Quantum Dot Array and Spectral Reconstruction Algorithm[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(11): 3370-3376. |
| [12] |
ZHOU Zi-hao1, YANG Fan2, 3, LI Dong1, WANG Jian-ping2, 3, XU Jian-hua1*. pH Dependent Time-Resolved Fluorescence Spectra of ZnSe Quantum Dots Based on Glutathione Ligands[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(10): 3178-3183. |
| [13] |
HU Jing-jing, TONG Chang-lun*. Study on the Interaction Between Carbon Quantum Dots and Human Serum Albumin by Spectroscopic Methods[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(04): 1107-1113. |
| [14] |
ZHANG Cong-cong1, LIU Lian-dong2, XIA Lei1, LI Xue3, ZHANG Xiao-kai1*. Preparation of ZnSe/ZnS Core-Shell Quantum Dots Under UV Irradiation[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2020, 40(11): 3409-3415. |
| [15] |
ZHANG Qiu-lan, ZHU Zhi, WEN Zi-jian, NI Yong-nian. Interaction Between Graphene Quantum Dots and Trypsin With Spectroscopic and Chemometrics Approaches[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2020, 40(10): 3141-3146. |
|
|
|
|
