• Zakir Khan Salam Khan
• H. R. Shaikh
• Sayyed Asra

Terbium doped Zinc Pyrophosphate (Zn2P2O7) is prepared first time by economical, simple and time saving slow vaporization synthesis technique keeping in mind its luminescence properties. XRD analysis and FTIR characteristics are carried out to confirm the structure and bonding of its constituents respectively. Surface morphology was studied by SEM images. The excitation spectra of Zn2P2O7: Tb3+ consists of single narrow band peaking at about 236 nm, which can be ascribed to the f-d absorption transition of Tb3+ activators. The emission spectrum of Zn2P2O7: Tb3+ consists of a series of sharp lines peaking at 489, 544, 586 and 622 nm corresponding to the 5D4-7Fj (j=3, 4, 5, 6) inner-shell transition of the Tb3+ ions. Among the emission lines from the 5D4 state the dominant emission is observed at 544 nm, corresponding to the 5D4-7F5 transition. The 5D4-7F5 emission line is the strongest in nearly all host crystals when the Tb3+ concentration is a few mol % or higher because this transition has the largest probability for both electric-dipole and magnetic-dipole induced transitions. The intensity of 489 nm line, which corresponds to 5D4-7F6 transition of Tb3+ ions is comparable and about one half the intensity of 5D4-7F5 line. The intensity of the emission lines 586 and 622 nm is weak and corresponds to 5D4-7F4 and 5D4-7F3 transition of Tb3+ ions. Hence this phosphor may find applicable for UV-LED.

Phosphate; Terbium; Photoluminescence; UV-LED

"Synthesis and Luminescence Properties of Green Emitting Terbium doped Zinc Pyrophosphate phosphor for UV-LED applications", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.842-847, June-2019, Available :http://www.jetir.org/papers/JETIR1908728.pdf

"Synthesis and Luminescence Properties of Green Emitting Terbium doped Zinc Pyrophosphate phosphor for UV-LED applications", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp842-847, June-2019, Available at : http://www.jetir.org/papers/JETIR1908728.pdf