Isochemical crystallization in condensed borate LaMgB5O10 glass-ceramics doped with optical probe Eu3+

The isochemical glass-ceramics doped with Eu 3+ were prepared by the heat treatment of lanthanum magnesium borate glass. The crystalline phase was chemically identical to a glass matrix and consisted of condensed borate LaMgB 5 O 10 . The isochemical crystallization process begins with the formation of rings by BO 4 groups. The emergence of ordered crystalline phase gives rise to intense charge transfer absorption of Eu 3+ , allowing the efficient luminescence under UV. The analysis of Judd–Ofelt parameters and comparison to purely crystalline samples obtained by solid-state synthesis reveal a switch of parameter relations from Ω 2 > Ω 4 for glass to Ω 2 < Ω 4 for crystals but also a maximum value of Ω 6 for glass-ceramic sample, which indicates enhanced structural rigidity and results in superior luminescence output. The quantum yield measurements confirmed higher luminescence efficiency for glass-ceramics compared to both pure glass and pure crystalline samples.