Surface-luminescence from thermally reduced bismuth-doped sodium aluminosilicate glasses

Luminescence from bismuth-germanate glasses and its manipulation through oxidants

“…As a higher basicity favors a higher valence state of bismuth, it is likely that the emission in the NIR occurs from lower redox states of bismuth. It has also been shown that the use of reducing agents could improve the emission intensity as long as no metallic particles are generated [2,14]. As an empirical rule, the optimal excitation wavelength for the species Bi x (with x = 0; 1 + ; 2 + ) is typically found in the range of 500 -800 nm, whereas the emission band lies usually in the range of 1000 -1700 nm [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] (however, also mid-infrared emission has been reported for, e.g., chalcogenide matrices) [27,28].…”

“…In addition, various subvalent species and ion clusters [11][12][13], Bi 0 or metallic bismuth particles have been reported. The question as to which species are dominant in a given material has significant consequences for the material's optical properties, which makes it crucial to delicately control the redox conditions [14]. For example, decreasing the redox state of bismuth towards the formation of metallic nanoparticles has been known as an easy method to tune glass color from yellow to reddish tints to deep black [15].…”

Precise frequency shift of NIR luminescence from bismuth-doped Ta2O5–GeO2glass via composition modulation

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] It has stimulated intense research on novel types of photonic materials featured in broader uorescence bandwidths, at best covering the entire telecom window of 1.2-1.65 mm. It is believed that this, in the long run, would ease data traffic radically.…”

“…For this purpose, various candidate materials have been examined. [4][5][6][7][8][9][10]12,17,23 However, these relevant reports, about the relation between optical properties and composition of Bi-doped materials, are limited to qualitative description. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] For these, within a decade, rapid progress has been witnessed from discovery of such glasses, to rst demonstration of lasing and then to their application in efficient all-ber optical ampliers and lasers.…”

Thermal collapse of SAPO-34 molecular sieve towards a perfect glass

“…Recently, SAPO-34 has drawn much attention as an excellent catalyst support for methanol-to-olefin (MTO) conversion due to its mild acidity and small pore openings (~3.8 Å in diameter) [12,13]. SAPO-type zeolites are also characterized by medium to strong acidity [14] and high thermal stability [15], both of which might be favorable for the incorporation of dopants in specific (low) redox states [16,17]. The thermal stability of SAPO-34 was examined by Watanabe et al [18].…”