(Y,Gd)BO3:Eu3+ and Y(V,P)normalO4:Eu3+ thin-film phosphors were deposited on conventional and corrugated substrates to test their applicability for use in transparent plasma display panels (PDPs). The exact target structure and stoichiometry of Y(V,P)normalO4:Eu3+ and (Y,Gd)BO3:Eu3+ transferred well to the single-phase film by optimizing the deposition conditions. The corrugated substrates consisting of nanorod-type two-dimensional photonic crystal layers enhanced the photoluminescence efficiency, albeit at the expense of transparency. We employed the fact that conventional PDPs would adopt a mixture powder of (Y,Gd)BO3:Eu3+ and Y(V,P)normalO4:Eu3+ as a compromise between luminance and color chromaticity. To achieve this compromise in a thin-film state, we prepared a sandwich-type thin film using (Y,Gd)BO3:Eu3+ and Y(V,P)normalO4:Eu3+ phosphors.

We examined non-stoichiometric CaAl(x)Si((7-3x)/4)N(3):Eu(2+) phosphors that were intentionally prepared with x = 0.7-1.3 to identify the origin of the deconvoluted Gaussian components that constitute the emission spectra of stoichiometric CaAlSiN(3):Eu(2+) phosphors. The Al/Si molar ratio around the Eu(2+) activator caused the deconvoluted Gaussian peaks. The Eu(2+) activator sites in Al-rich environments gave rise to the lower-energy emission peak, while those in Si-rich environments were related to the higher-energy emission peaks. Active energy transfer from the Eu(2+) activator site in the Si-rich environment to the Eu(2+) activator site in the Al-rich environment was confirmed. Particle swarm optimization was employed to estimate the nine unknown decision parameters that control the energy transfer process. All of the decision parameters were estimated within the range of reasonable values.

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