| 초록 |
As far as we know, the bulk CsPbBr3 has the difficulty of luminescent properties due to its small exciton binding energy (~40 meV). In this work, saturated green fluorescent powders designed with CsPbBr3/Al2O3 nanocomposites were easily synthesize by wet and dry processes. The green fluorescent powders consist of monoclinic CsPbBr3 small crystals attached on the surfaces of submicron-sized Al2O3. With a well-known concept, the wet process was ionized CsBr and PbBr2 in DSMO and then recrystallizes it on the Al2O3 surface. In contrast, a dry process was carried out as grinding the bulk CsPbBr3 powder mixed with above Al2O3 powders. In addition, emission spectrum peaks and FWHM values of 515 nm and 25 nm were shown in wet and dry processes. Moreover, these fluorescent powders work as down-converting materials on blue LED. As fabricated white LED package presented wide color gamut of 106.1% in NTSC at the luminance of 23 lm/W in compliance with the white point of (0.2993, 0.3161). |
