White light emitting OLEDs

T.K. Hatwar, J.R. Vargas, and V.V. Jarikov, Stabilized white-light-emitting OLED devices employing a stabilizing substituted perylene material, U.S. Patent 2,005,089,714, pp. 21 (2005). 

The EML with a multilayer structure for the lanthanide ions is very different from that of other phosphor materials such as iridium complexes. Multilayer structures with EMLs usually emit hybrid light which is used in white light emitting OLEDs [33]. For lanthanide complexes extremely pure light is achievable, because their emission is due to electronic transitions of... 

A recent OLED design involved a three-color emission to produce a white-light emitting OLED, as shown in 7,2.35., given on the next page. Note that the construction is similar to that we have already presented. The only difference is that three different colored emitting strata are involved ... 

Isobenzofurans are reactive Diels-Alder dienes, and they have been used for the construction of aromatic skeletons extensively [26]. A mixture of endo/exo cycloadducts obtained from the Diels-Alder reaction of isobenzofuran with a variety of dienophdes underwent dehydration under acidic conditions to give aromatic compounds. Isobenzofuran was generated in situ in the reaction by the loss of ethanol from the starting material cyclic acetal (Scheme 16.25) [27]. Using the approach in Scheme 16.25, a variety of naphthalimides have been synthesized that find application in DNA detection and white light-emitting OLEDs [28]. 

The fluorescence color converter technique [32] can, in principle, overcome much of this power loss by replacing the white light emitter with a blue-emitting organic stack, and the absorbing filters with green and red fluorescent dyes. Thus when a green pixel is desired, the OLED underneath is turned on and the blui... 

For recent review on white-emitting OLEDs see B.W. D Andrade and S.R. Forrest, White organic light-emitting devices for solid-state lighting, Adv. Mater., 16 1585-1595, 2004. 

---