Figure 8.

The comparison of emission spectra for the hybrid mesoporous materials with different rare earth ions (a): Eu3+, La3+–Eu3+, Gd3+–Eu3+, Y3+–Eu3+; and the comparison of emission spectra for the Y3+–Eu3+ heterometallic hybrid mesoporous materials with different molar ratio of Y3+:Eu3+: 1:9, 2:8, 3:7, 4:6, 5:5, 6:4, 7:3, 8:2, 9:1 (b)

Yan and Kong Nanoscale Research Letters 2010 5:1195-1203   doi:10.1007/s11671-010-9626-x