期刊
OPTICAL MATERIALS
卷 86, 期 -, 页码 600-605出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2018.10.043
关键词
Eu2+; Mn2+; Phosphors; Energy transfer; NUV-LED; Quantum efficiency
资金
- National Research Foundation of Korea - Ministry of Education, Science and Technology [NRF-2015R1D1A1A01059655, NRF-2018R1D1A3B07048543]
- BB21 + Project
- National Research Foundation of Korea [2018R1D1A3B07048543, 2015R1D1A1A01059655] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Near-ultraviolet (NUV)-excitable phosphors composed of Ba6-m-nEumMnnCa3YAlSi6O24 (m = 0.01-0.5, n = 0-0.5) were prepared via a solid-state reaction in a reducing atmosphere. The X-ray diffraction patterns of the single-phase orthosilicate Ba(6-m-n)Eu(m)Mn(n)Ca(3)YAlSi(6)O(24 )phosphors were examined to index the peak positions. The photoluminescence (PL) emission spectra of the phosphors were clearly observed under 365-nm excitation. The critical distance and electric multipole interaction were exploited. The dependence of the luminescent intensity of the Mn2+ co-doped host lattice on the Eu(2+)content was also investigated. Co-doping Mn(2+)and Eu2+ emitters in the Ba(6-m-n)Eu(m)Mn(n)Ca(3)YAlSi(6)O(24 )phosphors enabled efficient energy transfer from Eu2+ to Mn2+ ; the energy-transfer mechanism is also discussed. The Commission Internationale de I'Eclairage (CIE) coordinates near the blue, white, and orange regions of the obtained phosphors were observed. Thermal quenching of Ba5.7Eu0.2Mn0.1Ca3YAlSi6O24 phosphor was exploited in the temperature range of 298-448 K and at 193 K. The activation energy for thermal quenching of the phosphors was calculated. The relative quantum efficiency (QE) of Ba5.7Eu0.2Mn0.Ca3YAlSi6O24 phosphor was compared with that of the commercial YAG:Ce and the previously studied Ba8.8Eu0.1Mn0.1Y2Si6O24 phosphor. NUV-executable white Ba5.7Eu0.2Mn0.1Ca3YAlSi6O24 phosphor with a 365-nm LED chip was fabricated and the internal QE was measured. The color rendering index (CRI, R-a) at correlated color temperature (CCT) with the CIE coordinates was exhibited for the LEDs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据