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09월 06일 15시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제112회 대한화학회 학술발표회, 총회 및 기기전시회 안내
Synthesis and Characterization of Eu(III)-Incorporated Silica Nanoparticles for a Red LED
2013년 8월 29일 17시 19분 16초
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10월 16일 (수요일) 16:00~19:00
충남대학교 화학과, Korea
The powdered complex and the complex-incorporated silica particles were fabricated with 365-nm UV-LEDs. The PL properties of the fabricated LEDs operated at 3.0 V were investigated as a function of time. Figure 5 shows the intensity decay of the red emission. The intensity of the red emission from the powder-casted LED was decreased rapidly by 80 % as soon as the LED was on. The powdered complex was significantly degraded by the heat emitted from the pumping UV-LED, of which the junction temperature was higher than 150 ?C. Contrary, for the CS and the IS complexes, the intensity was maintained without loss after slightly down at the initial stage, while for the OS complex the intensity was gradually decreased. These results indicated that the silica matrix capping the complex well protected the complex from the thermal degradation. Figure 6a shows PL spectra of the fabricated LED devices. The PL spectra consisted of two strong bands. The sharp band and its satellite, peaking at 360 nm and 410 nm, respectively, were due to an emission from the pumping InGaN diode, and the low-energy bands, appearing in the 590 ? 700 nm region, were due to the emission from Eu(III). The relative intensity between the two strong bands was dependent on an amount of the casted phosphor. The CIE 1931 chromaticity of the three devices is shown in Figure 6b. The chromaticity index (x, y) varied from (0.5467, 3382) for the IS-fabricated LED and (0.5505, 0.3342) for the CS-fabricated LED to (0.4682, 0.3437) for the OS-fabricated LED. This blue-shift of the x-index was dependent on the relative intensity of the 410-nm satellite band to that of the red emission.
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