Synthesis, characterization and photophysical properties of three novel lanthanide materials

• It reports three novel lanthanide compounds. • They display green, red and blue photoluminescence. • The photoluminescence come from 5 D 4 → 7 F 6 of the Tb 3+ ions, 4 F 7/2 → 4 S 3/2 of the Nd 3+ ions and 4 F 9/2 ( 4 F 5/2 ) → 4 I 15/2 of the Er 3+ ions. • The semiconductor bandgaps are 2.89 eV, 3.12 eV and 4.64 eV. Three new lanthanide compounds with different structures, i.e. [Tb(2,6-naphthalenedisulfonic acid)(OH)(H 2 O) 2 ] n ( 1 ), [Nd(HIA) 2 (NO 3 )(H 2 O) 3 ] n 2 n (NO 3 )· n H 2 O ( 2 ; HIA = isonicotinic acid) and [Er 6 (H 2 O) 12 (NO 3 ) 6 (OH) 8 (O)]2NO 3 ·2H 2 O ( 3 ), were obtained from hydrothermal reactions. Their crystal structures were characterized with single-crystal X-ray diffraction. Compound 1 is characteristic of a two-dimensional (2-D) layer-like structure, compound 2 features a one-dimensional (1-D) chain-like structure, while compound 3 shows an isolated (0-D) Er 6 hexanuclear structure. The solid-state UV/Vis diffuse reflectance spectra show that the semiconductor bandgaps are 2.89 eV, 3.12 eV and 4.64 eV for compounds 1, 2 and 3 , respectively. The solid-state photoluminescent measurements exhibit that they can show green, red and blue emissions. These photoluminescence emissions are originated from the characteristic emissions of the 4 f electron intrashell transitions of the 5 D 4 → 7 F 6 of the Tb 3+ ions in compound 1 , the 4 F 7/2 → 4 S 3/2 of the Nd 3+ ions in compound 2 and the 4 F 9/2 ( 4 F 5/2 ) → 4 I 15/2 of the Er 3+ ions in compound 3 . Their CIE (Commission Internationale de I'Éclairage) chromaticity coordinates are (0.2451, 0.4041), (0.7334, 0.2666) and (0.1391, 0.0483). Their CCT (Correlated Color Temperature) are 8937 K, 400,100 K and 2654 K. Three lanthanide compounds with different structures were prepared. Their bandgaps are 2.89 eV, 3.12 eV and 4.64 eV They show green, red and blue emissions, which originate from the 4 f transitions of the 5 D 4 → 7 F 6 of the Tb 3+ ions, the 4 F 7/2 → 4 S 3/2 of the Nd 3+ ions and the 4 F 9/2 ( 4 F 5/2 ) → 4 I 15/2 of the Er 3+ ions. Their CIE chromaticity coordinates are (0.2451, 0.4041), (0.7334, 0.2666) and (0.1391, 0.0483). The CCT are 8937 K, 400,100 K and 2654 K.