| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 539664 | Microelectronic Engineering | 2011 | 4 Pages |
The effect of a two-dimensional Y2O3:Eu3+ photonic crystal (PC) pattern on the extraction efficiency of photoluminescence from the underlying Y2O3:Eu3+ thin-film phosphor was investigated. The photonic crystal structure was fabricated using a direct nano-imprint process with a Pechini-type Y2O3:Eu3+ sol as the nano-imprint resin and a patterned polydimethylsiloxane (PDMS) stamp as the mold. The elevated pressure and temperature of the nano-imprinting process converts the Y2O3:Eu3+ sol into a Y2O3:Eu3+ gel resulting in high definition transfer of the 2D patterns of the master template into the gel on top of the Y2O3:Eu3+ thin-film phosphor layer. The extraction efficiency of the 2D Y2O3:Eu3+ gel PC-assisted Y2O3:Eu3+ thin-film phosphor was approximately 3.7 times higher than a non-PC Y2O3:Eu3+ gel coated Y2O3:Eu3+ thin-film phosphor.
Graphical abstractIt is shown that the emission spectra of non-PCL and 2D PCL thin-film phosphors, measured at the normal angle (θ = 0°). The inset of graph shows a top view SEM image of the 2D photonic crystal patterns of Y2O3:Eu3+ gel with dot diameter of ∼270 nm and period of ∼700 nm. The 2D PCL thin-film phosphors exhibit about 4 times stronger luminescence under the same conditions, indicating that more light is escaping from the Y2O3:Eu3+ thin-film phosphors due to the PC structure.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Photonic crystal structure was fabricated using a direct nano-imprint process. ► Patterned PDMS stamp was used as the mold. ► Y2O3:Eu3+ TFPs were prepared by Pechini-type sol-gel reactions. ► PL emission spectra of 2D PCL Y2O3:Eu3+ TFPs were measured.
