Photoluminescence of rare‐earth/transition metal‐doped transparent/translucent polycrystalline Al₂O₃ ceramics: A review

Abstract

Transparent alumina doped with rare‐earth or transition metal oxides represents a group of materials suitable for optical applications. Because of the birefringence of alumina, their preparation is demanding on the quality of starting materials, their advanced shaping, and pressure‐assisted sintering. Spark plasma sintering and hot isostatic pressing have proven at achieving pore‐free fine microstructures exhibiting high in‐line transmission and a sufficient intensity of emitted light. The present review aims to summarize the results published on this topic, to compare them and on this base to propose other possible and/or appropriate approaches to future.

Synthesis and photoluminescence of novel blue‐emitting phosphor of Eu2+‐activated fluoroborate BaGaBO3F2

“…Materials activated by rare earth ions (RE) are highly important for their applications in luminescence display and optoelectronic devices 1–4 . Among them, Eu 2+ is known for the strong luminescence, which is attributed to the lowest state of 4f 6 5d 1 to ground state 8 S 7/2 (5d→4f) due to the strong interaction between the 4f and 5d orbitals 5–8 .…”

“…Materials activated by rare earth ions (RE) are highly important for their applications in luminescence display and optoelectronic devices. [1][2][3][4] Among them, Eu 2+ is known for the strong luminescence, which is attributed to the lowest state of 4f 6 5d 1 to ground state 8 S 7/2 (5d→4f) due to the strong interaction between the 4f and 5d orbitals. [5][6][7][8] Eu 2+ ions typically exhibit broad luminescence transitions strongly depending on their electronic configuration and the crystal field environment, 9 consequentially its luminescence chromaticity changes from ultraviolet to near-infrared.…”