Europium (II)-doped microporous zeolite derivatives with enhanced photoluminescence by isolating active luminescence centers
Demir, H. V.
ACS Applied Materials and Interfaces
Please cite this item using this persistent URLhttp://hdl.handle.net/11693/21712
Solid-state reaction is the most common method for preparing luminescent materials. However, the luminescent dopants in the hosts tend to aggregate in the high-temperature annealing process, which causes adverse effect in photoluminescence. Herein, we report a novel europium (II)-doped zeolite derivative prepared by a combined ion-exchange and solid-state reaction method, in which the europium (II) ions are isolated to a large extent by the micropores of the zeolite. Excited by a broad ultraviolet band from 250 to 420 nm, a strong blue emission peaking at 450 nm was observed for these Eu-embedded zeolites annealed at 800 °C in a reducing atmosphere. The zeolite host with pores of molecular dimension was found to be an excellent host to isolate and stabilize the Eu2+ ions. The as-obtained europium (II)-doped zeolite derivative showed an approximately 9 fold enhancement in blue emission compared to that of the general europium (II)-doped aluminosilicates obtained by conventional solid-state reaction, indicating that, by isolating active luminescence centers, it is promising to achieve highly luminescent materials. Also, the strong blue emission with broad UV excitation band suggests a potential candidate of phosphor for ultraviolet excited light-emitting diode. © 2011 American Chemical Society.
- Research Paper 
Showing items related by title, author, creator and subject.
FTIR study of low-temperature CO adsorption on Mn-ZSM-5 and MnY zeolites Effect of the zeolite matrix on the formation of Mn2+(CO)x geminal species Hadjiivanov, K.; Ivanova, E.; Kantcheva, M.; Ciftlikli, E. Z.; Klissurski, D.; Dimitrov, L.; Knoezinger, H. (Elsevier, 2002-08)Adsorption of CO on Mn-ZSM-5 zeolite at 85 K results in formation of physically adsorbed CO, several kinds of H-bonded CO and Mn2+ (CO)(x) geminal species (2202 cm(-1)). Decreasing the coverage during evacuation results ...
FTIR study of low-temperature CO adsorption on Mn-ZSM-5 and MnY zeolites. Effect of the zeolite matrix on the formation of Mn2+(CO) x geminal species Hadjiivanov, K.; Ivanova, E.; Kantcheva, M.; Ciftlikli, E.Z.; Klissurski, D.; Dimitrov L.; Knözinger H. (2002)Adsorption of CO on Mn-ZSM-5 zeolite at 85 K results in formation of physically adsorbed CO, several kinds of H-bonded CO and Mn 2+(CO)x geminal species (2202cm-1). Decreasing the coverage during evacuation results in ...
Tokay, M.S.; Yasar, E.; Aǧan, S.; Aydinli, A. (2014)In the light of growing importance of semiconductor nanocrystals for photonics, we report on the growth and characterization of annealed germanosilicate layers used for Ge nanocrystal formation. The films are grown using ...