Single Phase Zinc Sulfide Quantum Dots for Fabrication of White Light Emitting Diodes (WQLEDs)

doi:10.6023/A23050231

Acta Chimica Sinica ›› 2023, Vol. 81 ›› Issue (10): 1327-1333.DOI: 10.6023/A23050231 Previous Articles Next Articles

Original article

单相硫化锌量子点制作白光发光二极管(WQLEDs)

李奎琛^a, 郑开元^a, 何静嘉^a, 金泽浩^a, 何秋^b, 王丽丽^a^,^*()

a 东北林业大学化学化工与资源利用学院哈尔滨 150000
b 四川大学材料科学与工程学院成都 610000

投稿日期:2023-05-16 发布日期:2023-07-18
基金资助:
国家自然科学基金(21304014); 中央高校基本科研业务费(DL10BB04)

Single Phase Zinc Sulfide Quantum Dots for Fabrication of White Light Emitting Diodes (WQLEDs)

Kuichen Li^a, Kaiyuan Zheng^a, Jingjia He^a, Zehao Jin^a, Qiu He^b, Lili Wang^a()

a College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin 150000
b College of Materials Science and Engineering, Sichuan University, Chengdu 610000

Received:2023-05-16 Published:2023-07-18
Contact: *E-mail: wang13624516352@163.com
Supported by:
National Natural Science Foundation of China(21304014); Fundamental Research Funds for the Central Universities(DL10BB04)

Preparation of undoped rare earth element, inexpensive and environmentally friendly single-phase quantum dots luminescent materials is crucial for realizing large-scale commercial application of white-light quantum dots diodes (WQLEDs). In this work, zinc sulfide quantum dots (ZnS-QDs) were prepared by a one-step hydrothermal method. The experimental method was to add zinc acetate into the mixed solution of water and ethanol, adjust the pH to 5~6, and then add thiourea. All raw materials were evenly mixed and put into a high-temperature hydrothermal reactor, and then ZnS-QDs was synthesized under the high-temperature condition of 240 ℃. By changing the ratio of water and ethanol in the solution and adjusting the pH, ZnS-QDs was obtained. The fluorescence emission peak of ZnS-QDs was about 535~566 nm. The thermogravimetric analysis of the obtained ZnS-QDs showed that the thermal decomposition temperature was up to 680 ℃. The measured fluorescence quantum yield was 16.3%. The luminescence mechanism of zinc vacancy in ZnS-QDs and the influence of changing synthesis conditions on the band gap width were discussed by UV absorption spectrum and theoretical calculation. After the mixture of ZnS-QDs phosphors and organic silica gel was dropped on the ultraviolet LED chip with the excitation light source of 365 nm, the input voltage was 3.4 V and the current was 100~500 mA, the light was lit. Standard white quantum dot LEDs were obtained. The international commission on illumination (CIE) coordinates of WQLEDs at 300 mA are (0.3725, 0.4006), the color rendering index (CRI) is 76.6 and the correlation color temperature (CCT) was 4500 K. The tricolor ratio (R, G, B) was R=14.6%, G=83.5%, B=1.8%. It could be seen that green was the majority of the three colors, and the blue content was relatively small, which was conducive to the protection of eyes. This study provides a promising method for realizing WQLEDs using single-phase quantum dots.

Key words: single phase quantum dot, zinc sulfide, light-emitting diodes (LED), white-light quantum dots diodes

Cite this article

Kuichen Li, Kaiyuan Zheng, Jingjia He, Zehao Jin, Qiu He, Lili Wang. Single Phase Zinc Sulfide Quantum Dots for Fabrication of White Light Emitting Diodes (WQLEDs)[J]. Acta Chimica Sinica, 2023, 81(10): 1327-1333.

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Fig. & Tab. 7

Figure 1. XRD patterns of ZnS-QDs at different (a) reaction time, (b) solvent composition, (c) temperatures, and (d) pH

Figure 2. TEM image of ZnS-QDs at (a) 50 nm scale and (b) 5 nm scale, (c) lattice fringes of ZnS-QDs, and (d) particle size statistics

Figure 3. Emission spectra of ZnS-QDs at different (a) reaction time, (b) solvent composition, (c) temperatures, and (d) pH

Figure 4. (a) UV-visible diffuse reflectance of ZnS-QDs and (b) the band gap spectra processed by Kubelka-Munk (K-M) formula

Figure 5. Band structure diagram of (a) ZnS-QDs and (b) ZnS-QDs containing VZn

Figure 6. DTG curve of ZnS-QDs

Figure 7. (a) Photograph of WQLEDs working at 300 mA, (b) emission spectra of WQLEDs at 100~500 mA, (c) PL spectrum of the WQLEDs at 300 mA, and (d) color coordinates of WQLEDs

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单相硫化锌量子点制作白光发光二极管(WQLEDs)

Single Phase Zinc Sulfide Quantum Dots for Fabrication of White Light Emitting Diodes (WQLEDs)

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