Effect of Eu³⁺ Concentration on Luminescence Studies of Y₄Al₂O₉ Phosphor

Table 2

Shape factors (𝜇), activation energy (𝐸), and frequency factor(s) for UV irradiated Y₄Al₂O₉:Eu doped phosphor.

Eu concentration	𝑇1	𝑇𝑚	𝑇2	𝜏	𝛿	𝜔	𝜇=𝛿/𝜔	Activation energy (𝐸)	Frequency factor(s)
0.1% Eu	64	94	124	30	30	60	0.5	0.58	1×10^9
0.2% Eu	96	127	157	31	30	61	0.49	0.66	3×10^9
1% Eu	60	87	125	27	38	65	0.58	0.63	1×10^9
1.5% Eu	87	119	161	32	42	74	0.56	0.63	2×10^9
2% Eu	96	129	168	33	39	72	0.54	0.64	2×10^9
2.5% Eu	87	117	151	30	34	64	0.53	0.66	2×10^9