Multiligand Europium Complexes Incorporated Polyvinylpyrrolidone for Enhanced Solar Cell

Table 3

Photon number ratio, reduced matrix, and J-O intensity parameters (Ω₂, Ω₄, and Ω₆) of Eu³⁺ in Eu(BA)(TTA)₂/PVP and Eu(BA)(TTA)₂Phen/PVP under 367 nm UVA-LED excitation.

Samples	Emission transition	Wavenumber (cm^−1)				Photon number ratio	J-O intensity parameter (10^−20 cm^2)
Eu(BA)(TTA)2/PVP	^5D0 ⟶ ^7F1 (N1)	16894	0	0	0	—	—
	^5D0 ⟶ ^7F2 (N2)	16301	0.0032	0	0	N2/N1 = 15.777	Ω2 = 30.221
	^5D0 ⟶ ^7F4 (N4)	14275	0	0.0023	0	N4/N1 = 1.720	Ω4 = 6.880
	^5D0 ⟶ ^7F6 (N6)	12416	0	0	0.0002	N6/N1 = 0.287	Ω6 = 20.192
Eu(BA)(TTA)2 Phen/PVP	^5D0 ⟶ ^7F1 (N1)	16916	0	0	0	—	—
	^5D0 ⟶ ^7F2 (N2)	16301	0.0032	0	0	N2/N1 = 15.439	Ω2 = 29.579
	^5D0 ⟶ ^7F4 (N4)	14275	0	0.0023	0	N4/N1 = 1.854	Ω4 = 7.426
	^5D0 ⟶ ^7F6 (N6)	12336	0	0	0.0002	N6/N1 = 0.322	Ω6 = 23.158