Revealing Eu³⁺-doped yttrium pyrogermanate as a soft UV excitable phosphor: retaining the pros of the commercial phosphor and compensating for the cons

Abstract

Paucity of red emitting phosphor efficiently excitable in soft UV region has been a huge barrier in solid state lighting application from combo of near-UV LED exciting chip and down...

Yellow phosphor based on zero-dimensional antimony halide for white light-emitting diodes

“…4–6 It seems to be a good method to elevate the color quality by adding a narrowband red luminescent phosphor to YAG:Ce 3+ based WLEDs; however, this will definitely lead to a cost increment. As almost all commercial phosphors contain rare-earth elements, such as europium, 7 cerium 8 and terbium, 9 which face problems of supply and demand crises and price rises, it is particularly important to develop alternative phosphors without rare-earth elements.…”

Reddish-orange emitting Eu2−x Gd x Ge2O7 pyrogermanate ceramic phosphors: synthesis and role of Eu3+/Gd3+ substitution on the optical features

“…Gupta et al [25] reported a high-pressure analysis of Gd 1.99 Eu 0.01 Hf 2 O 7 emissions, being capable of choosing the emitting color by pressure variation. This lanthanide pair combination was also investigated in a tetragermanate host (Ba 2 Gd 2−x Eu x Ge 4 O 13 ) by Lipina et al [26] and presented promising features in photonic applications, ratifying a great perspective in Eu-Gd combined with Ge hosts [24,27]. High potential for application as red phosphors suitable in a large UV region of excitation has been demonstrated for pyrogermanate materials containing Eu-Gd, which have band gap energies around 5.60-5.90 eV [28,29].…”