|
|
| Type |
Poster Presentation |
| Area |
Inorganic Chemistry |
| Room No. |
Event Hall |
| Time |
4월 19일 (목요일) 11:00~12:30 |
| Code |
INOR.P-210 |
| Subject |
Fabrication of Free-Standing Quantum Dot Films using an Electrospray Method and Enhancement of the Film Stability by means of Polymer Passivation |
| Authors |
soyeon yoon, Ji Hye Oh, KEYONG LEE, YOUNG RAG DO1,*
Department of Chemistry, Kookmin University, Korea
1Department of Applied Chemistry, Kookmin University, Korea
|
| Abstract |
We fabricated free-standing electrosprayed (e-sprayed) quantum dot (QD) films for use instead of down-conversion (DC) phosphors for white-light-emitting diodes (W-LEDs). AgIn5S8/ZnS QDs and a thermoplastic polymer, poly(methylmethacrylate) (PMMA), were used as a DC material and a matrix, respectively. We applied the free-standing e-sprayed QD films to the top of blue LEDs to realize remote-type W-LEDs. The W-LED showed a luminous efficacy (LE) of 75.9 lm/W and a color rendering index (CRI) of 71 with an applied current of 60 mA. We also passivated the e-sprayed QD films with a UV-curable polymer, NOA 61, to improve stability of the films. The same procedure described above was also applied during the fabrication of the W-LED. The LE of the W-LED with bare e-sprayed film was reduced by 67% from 66.2 lm/W to 21.7 lm/W after two hours with an applied current of 60 mA, while with NOA 61 passivation, the LE was reduced in the e-sprayed film by only 26.3% from 74.7 lm/W to 55.3 lm/W after ten hours |
| E-mail |
yoonso19@kookmin.ac.kr |
|
121st General Meeting of the KCS