Excitation-wavelength- and size-dependent photo-darkening and photo-brightening of photoluminescence from PbS quantum dots in glasses

Yin, Qiaoyun; Liu, Chao; Wang, Jing; Zhao, Zhiyong; Heo, Jong; Xie, Jun; Han, Jianjun

doi:10.1364/ome.9.000504

Cited by 16 publications

(4 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure i illustrates the dual-band fluorescence of PbS–AS quantum dot glass samples when stimulated by an 808 nm laser. It is important to note that the near-infrared emission peaks of all PbS–AS quantum dot glass samples have a decreasing trend at 1400 nm, resulting in bimodal characteristic emission . The absorption peaks near 1400 and 1900 nm are attributed to hydroxyl, which induces the bimodal photoluminescence of PbS quantum dots in the near-infrared band.…”

Section: Resultsmentioning

confidence: 95%

“…It is important to note that the near-infrared emission peaks of all PbS−AS quantum dot glass samples have a decreasing trend at 1400 nm, resulting in bimodal characteristic emission. 43 The absorption peaks near 1400 and 1900 nm are attributed to hydroxyl, which induces the bimodal photoluminescence of PbS quantum dots in the near-infrared band. This results in the photoluminescence spectra having a torn state.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Nanoconfined Synthesis of Lead Sulfide Quantum Dots Embedded in Mesoporous Aluminosilicate Glass with Adjustable Near-Infrared Broadband Luminescence

Chen,

Lau

et al. 2024

Chem. Mater.

View full text Add to dashboard Cite

Functionalizing glass with optically active quantum dots has shown great potential in near-infrared bioimaging and optical communication. However, the size distribution of quantum dots is hard to control by traditional glass quenching method due to extremely high processing temperature (∼1300 °C), resulting in unexpected transmission loss and luminescent quenching of quantum dots embedded in a glass composite. Herein, we developed a nanoconfined synthesis of lead sulfide (PbS) quantum dots in a mesoporous aluminosilicate glass matrix at a relatively low temperature of 600 °C with adjustable near-infrared broadband luminescence. The sol−gel-synthesized glass composite precursor with high surface areas over 480 m 2 /g and a nanopore mean diameter of about 3.2 nm can enable the homogeneous dispersal of PbS quantum dots in the mesoporous glass matrix as well as restrict the overgrowth of quantum dots to prevent aggregation. The PbS−AS glass composites exhibited dual-band near-infrared luminescence, showcasing morphological and nonlinear saturable absorption properties. The 0.8PbS−AS glass served as an effective saturable absorber for a passively mode-locked Er-doped fiber laser, achieving a pulse repetition rate of ∼0.09 kHz/mW and a pulse width of ∼0.04 μs/kHz. The PbS−SA is confirmed to be suitable for a Q-switched mode-locking laser, showing high potential for mode-locked laser generation with further SA optimization.

show abstract

Section: Resultsmentioning

confidence: 95%

Section: ■ Results and Discussionmentioning

confidence: 99%

Nanoconfined Synthesis of Lead Sulfide Quantum Dots Embedded in Mesoporous Aluminosilicate Glass with Adjustable Near-Infrared Broadband Luminescence

Chen,

Lau

et al. 2024

Chem. Mater.

View full text Add to dashboard Cite

show abstract

“…According to figures 5 and 6, smaller NCs show weaker PL emissions. One possible explanation for this phenomenon can be the surface to volume ratio [37]. Since surface defects have a crucial role in the PL intensity, and smaller particles possess a higher surface to volume ratio, it seems that the effect of un-passivated surface defects can be more significant in smaller NCs.…”

Section: Resultsmentioning

confidence: 99%

“…Since surface defects have a crucial role in the PL intensity, and smaller particles possess a higher surface to volume ratio, it seems that the effect of un-passivated surface defects can be more significant in smaller NCs. These surface defects can trap the photo-generated charge carriers and alleviate the PL of NCs, which leads to weaker PL emission for smaller NCs [37].…”

Section: Resultsmentioning

confidence: 99%

Experimental study of the size-dependent photoluminescence emission of CBD-grown PbSe nanocrystals on glass

Hemati

Weng

2020

Nano Ex.

View full text Add to dashboard Cite

In this work, we study the size-dependent properties of Photoluminescence (PL) emissions of PbSe Nanocrystals (NCs) grown by Chemical Bath Deposition (CBD) method. In previous studies, PL emissions have been tuned by CBD-grown PbSe, and the growth mechanism was dependent on crystalized substrates such as GaAs. In this research, however, PL emissions are controlled over the midinfrared (MIR) range, through PbSe NCs, which are deposited on glass as an amorphous material. This study proposes an alternative approach to control PL emissions, which provides us with more freedom to fabricate low-cost MIR light sources as crucial components in remote sensing and gas analysis. Moreover, in this study, the advantage of the post-thermal method to control the NCs size, compared to the growth temperature, is shown.

show abstract

Quantum Dot‐Doped Optical Fibers

Zhu,

Sun,

Chai

et al. 2024

Laser & Photonics Reviews

View full text Add to dashboard Cite

Gain medium‐doped active optical fibers for optical amplification and long‐range transmission have triggered a lot of researches. Traditional rare‐earth ion‐doped active fibers have non‐adjustable emissions, narrow band luminescence, limited gain enhancement, and other challenges. The unique optical properties of quantum dots (QDs) can further improve the doped optical fibers in the light amplification capacity, temperature sensitivity and to gain a broad‐spectrum coverage and lower laser threshold and other superiorities. However, there are few systematic discussions on the development of the technologies and applications of those QD‐doped optical fibers. In this review, the optical properties, temperature characteristics and optical amplification mechanisms of QD‐doped optical fibers are outlined. Then, the preparation technologies and the applications of QD‐doped optical fibers are highlighted. Additionally, the existing challenges and future development prospects of QD‐doped optical fibers are discussed.

show abstract

Excitation-wavelength- and size-dependent photo-darkening and photo-brightening of photoluminescence from PbS quantum dots in glasses

Cited by 16 publications

References 54 publications

Nanoconfined Synthesis of Lead Sulfide Quantum Dots Embedded in Mesoporous Aluminosilicate Glass with Adjustable Near-Infrared Broadband Luminescence

Nanoconfined Synthesis of Lead Sulfide Quantum Dots Embedded in Mesoporous Aluminosilicate Glass with Adjustable Near-Infrared Broadband Luminescence

Experimental study of the size-dependent photoluminescence emission of CBD-grown PbSe nanocrystals on glass

Quantum Dot‐Doped Optical Fibers

Contact Info

Product

Resources

About