Phosphors films

Early work in the 1960s on thin-hlm EL (TEEL) involved the excitation of Al/ZnS (activated by Mn or Cu) deposited on glass, but the key step forward was taken when the double-insulator structure was developed as shown in Figure 3.30. As can be seen the ZnS film is sandwiched between two insulating layers, limiting the amount of charge transferred to the device and also totally encapsulating the phosphor film. In spite of this the EL device still suffered from lifetime problems and it was not until 1978, when Sharp demonstrated a 240 x 320 display, that this problem was overcome. 

PREPARATION, PATTERNING AND LUMINESCENCE PROPERTIES OF RARE EARTH-DOPED YVO4 NANOCRYSTALLINE PHOSPHOR FILMS VIA SOL-GEL SOFT LITHOGRAPHY... 

So far neither work of phosphor films via the Pechini-type sol-gel proeess nor their direct patterning via soft lithography have been reported in literature. Yttrium vanadate (YVO4) has been shown to be a useful host lattice for rare earth ions to produce phosphors emitting a variety of coIors[7]. In this paper, we report a Pechini sol-gel synthesis of the nanocrystalline YV04 A (A=Eu, Sm, Er ) thin phosphor films and their... 

The patterned and non-pattemed phosphor films show similar optical properties. So all the characterizations for the optical properties were performed on the non-pattemed films due to their relatively easy availability. 

Figure 3. Optical micrographs of the patterned YV04 0.04Eu phosphor films annealed at 700 C.

Hao, J.H., Studenikin, S.A., and Cocivera, M., Blue, green and red cathodoluminescence of Y2O3 phosphor films prepared by spray pyrolysis, J. Lumin., 93, 313, 2001. 

Details have appeared of a photovoltaic cell having a high conversion efficiency in which the output efficiency is enhanced by use of a phosphor film containing a terbium bipyridine complex, and of a photorechargeable battery incorporating a conducting polymer of polypyrrole deposited on carbon fibres coated with ferric chloride. The irradiated electrode is thought to possess semiconductor... 

Tao S, Gu ZH, Nathan A (2002) Fabrication of Gd202S Tb based phosphor films coupled with photodetectors for X-ray imaging applications. J Vac Sci Technol A Vac Surf Films 20 1091-1094... 

Fig. 9.13 CIE colour coordinate of an rGO-embedded remote phosphor compared with phosphor film. Reproduced from Ref [56] by permission of The Royal Society of Chemistry...

---