Efficient and environmentally friendly white light-emitting diodes with InP-based quantum dots embedded in mesoporous silica

doi:10.1016/j.jmst.2024.02.047

J. Mater. Sci. Technol. ›› 2024, Vol. 200: 104-111.DOI: 10.1016/j.jmst.2024.02.047

• Research Article • Previous Articles Next Articles

Efficient and environmentally friendly white light-emitting diodes with InP-based quantum dots embedded in mesoporous silica

Zhongjie Cui^a, Shuaitao Qin^a, Haiyang He^a, Jinchan Zhao^a, Rui Jiang^a, Yifeng Xing^b, Shiliang Mei^a,*, Wanlu Zhang^a,*, Ruiqian Guo^a,b,c,d,*

^aInstitute for Electric Light Sources, School of Information Science and Technology, Fudan University, Shanghai 200433, China;
^bInstitute of Future Lighting, Academy for Engineering and Technology, Fudan University, Shanghai 200433, China;
^cZhongshan-Fudan Joint Innovation Center, Zhongshan 528437, China;
^dYiwu Research Institute of Fudan University, Chengbei Road, Yiwu 322000, China

Received:2023-11-29 Revised:2024-01-30 Accepted:2024-02-19 Published:2024-11-20 Online:2024-03-28
Contact: *E-mail addresses: meishiliang@fudan.edu.cn (S. Mei), fdwlzhang@fudan.edu.cn (W. Zhang), rqguo@fudan.edu.cn (R. Guo).

Abstract

Abstract: As one of the promising next-generation light conversion materials, indium phosphide quantum dots (InP QDs) deserve much attention due to their great optical performances and environmentally friendly properties in particular. Herein, InP-based QDs are embedded into mesoporous SBA-15 and solid QDs/SBA-15 composites are prepared, which exhibit 1.5 times higher photoluminescence quantum yield (PLQY) and narrower full width of half maximum (FWHM) than traditional QDs powder thanks to the reduction of light reabsorption and the optical waveguide effect of mesoporous structure. These advantages contribute to the performance enhancement of light-emitting diodes (LEDs). The luminous efficacy of the LED with green QDs/SBA-15 is 99.49 lm/W, which is higher than that of QDs powder (66.14 lm/W). In addition, the white LED fabricated with green and red InP-based QDs/SBA-15 shows luminous efficacy of 61.38 lm/W. More importantly, the luminous efficacy of the white LED is improved to 129.62 lm/W when using the K₂SiF₆:Mn⁴⁺ instead of red InP-based QDs/SBA-15, because the K₂SiF₆:Mn⁴⁺ does not absorb the emission from green InP-based QDs/SBA-15. This value is higher than those white LEDs with InP-based QDs reported previously. It is believed that this study demonstrates the promising potential of InP-based QDs for optoelectronic applications.

Key words: Indium phosphide, SBA-15, White light-emitting diodes, Luminous efficacy

Zhongjie Cui, Shuaitao Qin, Haiyang He, Jinchan Zhao, Rui Jiang, Yifeng Xing, Shiliang Mei, Wanlu Zhang, Ruiqian Guo. Efficient and environmentally friendly white light-emitting diodes with InP-based quantum dots embedded in mesoporous silica[J]. J. Mater. Sci. Technol., 2024, 200: 104-111.

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Efficient and environmentally friendly white light-emitting diodes with InP-based quantum dots embedded in mesoporous silica

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