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

Bartosz Bondzior

doi:10.1364/OL.521244

Optics Letters
Vol. 49,
Issue 8,
pp. 2125-2128
(2024)
•https://doi.org/10.1364/OL.521244

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

Bartosz Bondzior

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Bartosz Bondzior, "Isochemical crystallization in condensed borate LaMgB₅O₁₀ glass-ceramics doped with optical probe Eu³⁺," Opt. Lett. 49, 2125-2128 (2024)

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Abstract

The isochemical glass-ceramics doped with Eu³⁺ 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 LaMgB₅O₁₀. The isochemical crystallization process begins with the formation of rings by BO₄ groups. The emergence of ordered crystalline phase gives rise to intense charge transfer absorption of Eu³⁺, 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 Ω₂> Ω₄ for glass to Ω₂< Ω₄ for crystals but also a maximum value of Ω₆ 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.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Sample	β_0–1	β_0–2	β_0–4	β_0–6	Ω₂	Ω₄	Ω₆
	(%)				(10⁻²⁰cm²)±0.2
As-prepared glass^a	16%	58%	23%	3%	5.9	4.8	10.3
850°C/30 min	17%	53%	26%	4%	5.0	4.9	12.3
850°C/60 min	19%	51%	26%	4%	4.3	4.4	11.4
LaMBO crystal	24%	45%	27%	4%	3.1	3.7	9.7

Sample	A_rad	A_nrad	A_tot	τ_rad	τ_exp	η (QE)	QY (±5%)
	(s⁻¹)			(ms)		(%)
As-prepared glass	331	125	457	3.02	2.19	73%	58%
850°C/30 min	357	67	424	2.80	2.36	84%	103%^a
850°C/60 min	324	86	410	3.09	2.44	79%	82%
LaMBO crystal	260	101	361	3.84	2.71	72%	0%^b

Sample	β_0–1	β_0–2	β_0–4	β_0–6	Ω₂	Ω₄	Ω₆
	(%)				(10⁻²⁰cm²)±0.2
As-prepared glass^a	16%	58%	23%	3%	5.9	4.8	10.3
850°C/30 min	17%	53%	26%	4%	5.0	4.9	12.3
850°C/60 min	19%	51%	26%	4%	4.3	4.4	11.4
LaMBO crystal	24%	45%	27%	4%	3.1	3.7	9.7

Sample	A_rad	A_nrad	A_tot	τ_rad	τ_exp	η (QE)	QY (±5%)
	(s⁻¹)			(ms)		(%)
As-prepared glass	331	125	457	3.02	2.19	73%	58%
850°C/30 min	357	67	424	2.80	2.36	84%	103%^a
850°C/60 min	324	86	410	3.09	2.44	79%	82%
LaMBO crystal	260	101	361	3.84	2.71	72%	0%^b

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Optics Letters