1. Structure, Judd-Ofelt analysis, and spectral characteristics of terbium doped P2O5-B2O3-ZnO-SrO glasses for green lasers and trichromatic white light-emitting diodes.
- Author
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Ma, Nanshan, Luo, Zhiwei, Liang, Haozhang, He, Longqing, Lu, Anxian, and Liu, Taoyong
- Subjects
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LIGHT emitting diodes , *DIPOLE-dipole interactions , *RAMAN spectroscopy , *BRANCHING ratios , *DOPING agents (Chemistry) , *GLASS-ceramics - Abstract
The Tb3+ doped P 2 O 5 -B 2 O 3 -ZnO-SrO (PBZS system) glasses were prepared by the melt-quenching method. The structural, physical, thermal, and optical properties of the Tb3+ doped PBZS glasses are thoroughly investigated. The thermal behaviour shows that the PBZS system exhibits a higher thermal stability. FTIR and Raman spectra reveal that the lower OH- content and phonon energy favors the fluorescent properties. XPS analysis reveals that the Tb ions predominantly exist in the trivalent state. The Judd-Ofelt theory indicates a higher covalency between the Tb3+ and O2- ions. Based on the excitation spectra, the phonon sideband characteristics of Tb3+ are observed, which has rarely been reported in previous studies. Under 378 nm excitation, all the glasses display cold and intense green emissions. The spectral results indicate that the optimum doping content of Tb 2 O 3 is 1.5 mol%, at which point the quantum yield is 29.67 %, and even reaches or exceeds those of the Tb3+ doped glass-ceramics (28.62 %). The energy transfer between the Tb3+ ions is mainly dominated by the dipole-dipole interactions. The lifetimes obtained are all at the millisecond level. Time-resolved emission spectra confirm the photoluminescent stability of the Tb3+ ions. The PBZS glass doped with 1.5 mol% Tb 2 O 3 presents the higher branching ratio (71.69 % >> 50 %), emission cross-section (2.20 × 10−21 cm2), gain bandwidth (2.09 × 10−27 cm3), and optical gain (3.54 × 10−24 cm2·s). A nearly negligible chromaticity shift (0.94–2.33 × 10−2) in 293–473 K that the Tb3+ doped PBZS glasses feature excellent thermochromic properties and thermal stability. The PBZS glass doped with 1.5 mol% Tb 2 O 3 is a potentially preferable fluorescent material for exploiting green lasers and trichromatic white light-emitting diodes (WLEDs). [Display omitted] • Tb3+ doped P 2 O 5 -B 2 O 3 -ZnO-SrO glasses have been fabricated. • Glass doped with 1.5 mol% Tb 2 O 3 has optimal emission and fluorescent stability. • High quantum yield of 29.67 % even matches or exceeds glass ceramic system. • 1.5 mol% Tb 2 O 3 doped PBZS glass has potential for green lasers and WLEDs. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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