Disclosed is an organic light-emitting device operating similarly to a bipolar transistor. In one aspect, an expansion assembly is run into the wellbore at the lower end of a string of coiled tubing. The filter material may be incorporated in the substrate at the time of creating the substrate or may be selectively diffused in the substrate through a process of masking the substrate, exposing the substrate to the filter material, and heating the substrate in order to diffuse the filter material in the substrate. At least one through hole is formed in the organic EL display device so as to allow gas inside the organic EL display device to flow out during an encapsulation process. At least one short posting index is generated, which includes second index terms and a short posting list for each second index term, enumerating documents in which the second index terms occur.