Photovoltaic cells can be manufactured using a pattern region that substantially covers the usable surface area of a crystalline workpiece. When rotated to contact with the silica gel roller, the sealing blades will orderly carry out sealing at a same sealing portion of a plastic bag. An anchor filament extends through the headpiece lumen, has at least one proximal end secured to the proximal end of the headpiece, and has a distal portion defining an eye positioned distal to the distal end of the headpiece. Thereby, a sliding device 1 having excellent seizure resistance as compared with conventional sliding devices can be provided. The light-emitting device of the present invention includes a host containing two kinds of dopants, wherein a dopant having a longer maximum-emission wavelength is doped in a low concentration and has a substituent.