METHOD FOR PRODUCING LUMINOUS MATERIAL

To provide a method for producing a luminous material having a large luminance value usable as outdoor use.SOLUTION: A light-emitting material having high light-emitting efficiency is manufactured by using Eu metal as an activator and Sr0.9Al2O4 as a base material, mixing the materials and filling a small-sized crucible, accommodating the small-sized crucible in a middle-sized crucible, filling a gap between the small-sized crucible and the middle-sized crucible with activated carbon, and heating the crucibles at 1,500°C for 10 hours in a tunnel type atmospheric heating furnace (first heating treatment). A luminous material having a crystal diameter of about 40 microns and a Dy dissolution amount of 0.5% is manufactured by crushing the light-emitting material having high light-emitting efficiency by a ball mill, then adding Dy2O3, B2O3 and a base material to the light-emitting material, agitating and mixing the luminous raw material and filling the small-sized crucible, storing the small-sized crucible in the middle-sized crucible, filling a gap between the small-sized crucible and the middle-sized crucible with activated coal, then closing the lid, and heating the crucibles at 1,500°C for 10 hours in a batch type tunnel heating furnace (second heating treatment).SELECTED DRAWING: Figure 4 【課題】 屋外用途として使用できる大きな輝度値の蓄光材の製造方法を提供する。【解決手段】賦活剤としてＥｕ金属を使用し、母材としてＳｒ０．９Ａｌ２Ｏ４を使用し、これらを混合して小型坩堝内に充填し、この小型坩堝を中型坩堝内に収め、小型坩堝と中型坩堝の隙間に活性炭を充填し、トンネル式大気加熱炉で１５００℃×１０時間加熱処理（一回目の加熱処理）して発光効率が高い発光材料を作製する。この発光効率が高い発光材料をボールミルで粉砕した後、Ｄｙ２Ｏ３及びＢ２Ｏ３及び母材を添加し、この蓄光原料を攪拌混合して小型坩堝内に充填し、この小型坩堝を中型坩堝内に収め、小型坩堝と中型坩堝の隙間に活性炭を充填し、その後蓋を閉め、バッチ式トンネル加熱炉で１５００℃×１０時間加熱処理（二回目の加熱処理）することで、結晶粒径が４０ミクロン前後で、Ｄｙ固溶量が０．５％の蓄光材を作製する。【選択図】 図４