Deep-UV-Driven Emission-Tailorable Borosilicate Glasses by Utilization of Sn²⁺Cations as Versatile Energy-Transfer Establishers

Abstract

The emission properties of ns 2 -type Sn 2+ emission centers were demonstrated in CaO-B 2 O 3 -SiO 2 glasses. The broad excitation bands, which are assumed to be composed of S 1 and S 2 sub-bands, correlate strongly with Sn 2+ doping content. The blue Sn 2+ emission bands can be tailored by tuning Sn 2+ coordinate field. Significant enhancement of Sn 2+ emission was observed in B 2 O 3 -rich glasses. Owing to energy-transfer (ET) from Sn 2+ to Tb 3+ /Mn 2+ , significant enhancement of Mn 2+ and Tb 3+ emissions (32 times for Tb 3+ ) were obtained. Moreover, a wide-range-adjustable full-color emitting was achieved via tuning the ET ratio of Sn 2+ →Mn 2+ to Sn 2+ →Tb 3+ and modifying glass structures. Our research extends the understanding of the interactions between Sn 2+ and Mn 2+ /Tb 3+ in amorphous materials, and these deep-light-induced glasses show potential application in lighting and display fields.Nowadays, solid-state lighting (SSL) in the form of phosphorconverted light-emitting diodes (LEDs) has become more widespread. 1-3 These SSL devices are expected to replace conventional fluorescent lamps in the near future because of vital advantages such as superior efficiency, environmental friendliness and so on. Presently, deep ultraviolet (UV) LEDs with the emission wavelengths in UV-C (190-280 nm) and UV-B (280-315 nm) are being actively developed worldwide for their wide use in germicidal and biochemical applications. 4 More recently, the combination of high-power and deep-UV excitation sources with green, blue and red tricolor emission phosphors to generate white-light has aroused scientists' great interests. [4][5][6] Meanwhile, it is urgent to develop single-component white-emitting phosphors excited by deep-UV sources. 4-7 Specifically, recent development in shorter wavelength excitation sources further enables the practical implementation of deep-UV pumped lamps. However, the organic sealant resin for these powdered phosphors can be damaged by the deep-UV and high-power lights. 5,6 Therefore, we emphasize that inorganic glass phosphors with good emission properties and excellent durability are one of the potential phosphor candidates for further practical applications.Compared with powdered phosphors used for LEDs, transparent glasses exhibit many advantages, such as lower production cost, better thermal stability, epoxy-resin-free assembly process, and wide range for microstructure design. 3,6,8 Investigation into photoluminescence properties of amorphous glass phosphors for LEDs has been carried out extensively, but it was mainly limited to rare-earth (RE) ions activated glasses. 6,8-10 However, RE ions with parity forbidden f-f transitions cannot be efficiently pumped by UV-light due to their small absorption cross sections. 11 It is notable that glasses containing ns 2 -type (n ≥ 4) emission centers, such as Sn 2+ , Bi 3+ , Sb 3+ , Tl + , Pb 2+ and Hg 0 , have attracted considerable attention recently due to strong photoluminescence (PL) properties for the parity allowed transitions. Moreover, the ...

Tunable Mission and Trichromatic White‐Emitting in Oxyfluoride Glasses by Utilization of Cu+ Ions as Multiple Energy‐Transfer Creators

“…Meanwhile, Mn 2+ in [ 4 A 1 (G), 4 E(G)] populated level relax to 4 T 1 (G) level nonradiatively, and finally emit orange-red photons due to 4 T 1 (G)? 6 A 1 (S) transition.…”

“…Recent evolution in SSL technology to realize color‐tunable and white‐light emission has led to a promising route, which is utilizing ultraviolet (UV) LED sources to pump phosphors . Currently, deep‐UV and high‐power excitation sources in the form of deep‐UV LEDs with special emission wavelength in UV‐C (280–190 nm) and UV‐B (280–315 nm) are attracting extensive researches because of their potential use in germicidal and biochemical applications, etc . Interestingly, as an alternative excitation sources for powdered phosphors, they are of significance for the better optical performances of deep‐UV‐driven white‐LEDs .…”

“…3,4 Currently, deep-UV and high-power excitation sources in the form of deep-UV LEDs with special emission wavelength in UV-C (280-190 nm) and UV-B (280-315 nm) are attracting extensive researches because of their potential use in germicidal and biochemical applications, etc. 5,6 Interestingly, as an alternative excitation sources for powdered phosphors, they are of significance for the better optical performances of deep-UV-driven white-LEDs. 5 More recently, significant efficiency enhancement of deep-UV and mid-UV emitters in high Al-modified AlInN and AlGaN alloys further enables the practical implementation of UV-induced white-LEDs.…”

White‐light emission and red scintillation from Mn2+ ions single‐doped aluminum‐silicate glasses

“…15 Moreover, the energy-level distribution in Mn 2+ -doped glass may be slightly narrowed, resulting in the change of the bandwidths related to emission bands. 60 Figure 9(A) shows the red-shifts of the GAS:xMn 2+ glasses in the PL and XEL. It can be seen that the glasses exhibits larger redshifts in XEL.…”

Influence of Cu+ cations on photoluminescence properties of Tb3+ in Cu+–Na+ ion-exchanged sodium-borosilicate glasses

“…However, the narrow line width and the low oscillator strength of the parity-forbidden 4f → 4f absorption transitions of RE cations result in a weak absorptivity in the ultraviolet (UV) range [1,4,7,8]. As a result, RE cations with the small absorption cross section cannot be efficiently pumped by UV excitation sources [1,9,10]. Consequently, it is of challenge to improve the photoluminescence (PL) performance of RE ions upon UV-light excitation.…”