Pressure-induced site swapping, luminescence quenching, and color tunability of Gd2Hf2O7:Eu3+ nanoparticles

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

“…In particular, recent investigations concerning chemical compositions that involve the coexistence of Eu and Gd in pyrocompounds structures have been aiming at the development of promised light-emitting devices [24,25]. 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.…”

“…In particular, recent investigations concerning chemical compositions that involve the coexistence of Eu and Gd in pyrocompounds structures have been aiming at the development of promised light-emitting devices [24,25]. 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]. For these materials, it was also observed a high luminescence efficiency under the deep ultraviolet region (energy-transfer process from Gd 3+ to Eu 3+ ) as well as under the soft UV region (due to the Eu 3+ 5 L 6 ← 7 F 0 contribution) [24,25].…”