Effect of topological structure on photoluminescence of PbSe quantum dot‐doped borosilicate glasses

Abstract

Borosilicate glasses doped with PbSe quantum dots (QDs) were prepared by a conventional melt-quenching process followed by heat treatment, which exhibit good thermal, chemical, and mechanical stabilities, and are amenable to fiberdrawing. A broad near infrared (NIR) photoluminescence (PL) emission (1070-1330 nm) band with large full-width at half-maximum (FWHM) values (189-266 nm) and notable Stokes shift (100-210 nm) was observed, which depended on the B 2 O 3 concentration. The PL lifetime was about 1.42-2.44 ls, and it showed a clear decrease with increasing the QDs size. The planar [BO 3 ] triangle units forming the two-dimensional (2D) glass network structure clearly increased with increasing B 2 O 3 concentration, which could accelerate the movement of Pb 2+ and Se 2À ions and facilitate the growth of PbSe QDs. The tunable broadband NIR PL emission of the PbSe QD-doped borosilicate glass may find potential application in ultra-wideband fiber amplifiers. K E Y W O R D S crystallization, glass topological structure, optical properties, PbSe quantum dots, photoluminescence lifetime How to cite this article: Xu Z, Liu X, Jiang C, et al. Effect of topological structure on photoluminescence of PbSe quantum dot-doped borosilicate glasses.

Semiconductor Quantum Dots: An Emerging Candidate for CO2 Photoreduction

“…For example, by changing the reaction temperature, the molar ratio of Cl/Br or Br/I, and/or the reaction time, high‐quality perovskite CsPbX 3 (X = Cl, Br, I) QDs with size‐ and composition‐tunable bandgap can cover entire visible‐light region (410–700 nm) ( Figure ) . Besides, some narrow‐bandgap QDs (for example, PbS, PbTe and PbSe) can even expand their light absorption to NIR region with size and/or structure regulation, thereby occupying nearly the whole range of solar irradiation. The excellent light‐harvesting property of semiconductor QDs is a basic advantage for photocatalysis.…”

Effect of ZnO on the crystallization and photoluminescence of CsPbI3 perovskite quantum dots in borosilicate glasses

“…We consider that the red shift of absorption edge and PL peak wavelength is attributed to the quantum size effect. The results of FT‐IR and Raman spectra suggest that with increasing ZnO concentration the number of [SiO 4 ] tetrahedron units forming the 3D glass network structure clearly decreases, resulting in a decrease in glass network connectivity, which is beneficial for the movement of Cs + , Pb 2+ and I − ions and the growth of CsPbI 3 QDs in the glass 30,33 . However, with the further ZnO concentration, excessive crystallization of perovskite QDs causes the darkening of the resultant glass samples and the decrease in PL intensity, which can be ascribed to the enhanced coupling by high‐concentration QDs and reabsorption effect.…”

“…The results of FT-IR and Raman spectra suggest that with increasing ZnO concentration the number of [SiO 4 ] tetrahedron units forming the 3D glass network structure clearly decreases, resulting in a decrease in glass network connectivity, which is beneficial for the movement of Cs + , Pb 2+ and I − ions and the growth of CsPbI 3 QDs in the glass. 30,33 However, with the further ZnO concentration, excessive crystallization of perovskite QDs causes the darkening of the resultant glass samples and the decrease in PL intensity, which can be ascribed to the enhanced coupling by high-concentration QDs and reabsorption effect. Figure 4D shows the excitation spectra of glass samples with different ZnO concentrations measured under the respective PL peak wavelengths (as shown in Table 1), indicating that the CsPbI 3 QDs exhibit a broadband excitation band.…”

Mixed alkali effects in Er3+‐doped borate glasses: Influence on physical, mechanical, and photoluminescence properties

“…8 By controlling the borate speciation, a variety of physical properties of glass can be engineered of density, viscosity, refractive index, chemical durability, atom diffusion, ionic and thermal conductivities, thermal expansion coefficient, microhardness, biocompatibility, and aggregation/chemical state of dopants etc. 3,[9][10][11][12][13][14] For examples, recently, a record-high resistance to crack damage was reported in a lithium aluminoborate glass, owing to the self-adaptive nature of the glass network through the transformation of nonring [BØ 3 ] to [BØ 4 ] − during densification. 3 Trigonal boron was found to be more favorable than tetrahedral one for promoting fast and effective ion exchange.…”

“…The planar [BØ 3 ] was assumed to ease the movement of Pb 2+ and Se 2− ions and thus facilitated the growth of PbSe quantum dots in glass. 12 However, due to the nonlinear variation in the borate speciation with network modifier content, the properties of borate glasses do not vary monotonically with modifier content, which is known as "boron anomaly" (BA). 11 Specifically, the addition of alkali metal oxide, (A 2 O, where A = Li, Na, K, Rb, Cs), brings drastic changes in the structural units via two different mechanisms 15,16 : by changing threefold coordinated boron (denoted by B [3] ) to fourfold coordinated one (denoted by B [4] ) as:…”