The present invention relates to an erectable andor collapsible floral easel for holding a floral object, and more particularly but not by way of limitation, to an erectable or collapsible floral easel for holding a floral object. The phosphor has an empirical formula:Ln2-x-yB22O36:Mnx. A protection voltage measurement portion measures a cell voltage of each battery cell. The concentration of the rare-gas element in the at least one region as measured in the thickness direction thereof decreases continuously from the upper surface of the at least one region toward its lower surface.