SUBSTRATE FOR OLED, METHOD OF FABRICATING THE SAME AND ORGANIC LIGHT-EMITTING DEVICE HAVING THE SAME
A substrate for an organic light-emitting diode (OLED) which can improve the light extraction efficiency of the organic light-emitting device while securing transmittance, a method of fabricating the same, and an organic light-emitting device having the same. The substrate for an OLED is a substrate on which the OLED is to be deposited. The substrate is made of transparent crystallized glass in which a number of crystal grains are distributed.
1 . A substrate on which an organic light-emitting diode is to be deposited, comprising transparent crystallized glass in which a number of crystal grains are distributed.
2 . The substrate of claim 1 , wherein a size of the crystal grains ranges from 0.01 to 3 μm.
3 . The substrate of claim 1 , wherein the transparent crystallized glass comprises an amorphous structure in a range from 10 to 25 volume percent.
4 . The substrate of claim 1 , wherein the transparent crystallized glass comprises lithium aluminosilicate glass.
5 . The substrate of claim 4 , wherein the crystal grains comprise a crystalline phase of one selected from the group consisting of cordierite, silica, eucryptite and spodumene.
6 . The substrate of claim 1 , wherein a surface roughness (R RMS ) of the substrate is 0.01 μm or less.
7 . The substrate of claim 1 , wherein a visible transmittance of the substrate is 50% or greater.
8 . A method of fabricating a substrate which comprises transparent crystallized glass, and on which an organic light-emitting diode is to be deposited, the method comprising heat-treating the transparent crystallized glass that contains a nucleation agent that promotes precipitation of crystal grains, thereby controlling a size of the crystal grains that are to be precipitated.
9 . The method of claim 8 , wherein heat-treating the transparent crystallized glass comprises heat-treating the transparent crystallized glass at a temperature ranging from 850 to 1000° C. for 1 to 2 hours.
10 . The substrate of claim 8 , wherein the crystal grains comprise a crystalline phase of one selected from the group consisting of cordierite, silica, eucryptite and spodumene.
11 . An organic light-emitting device comprising the substrate recited in claim 1 as a light extraction substrate.