期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 120, 期 33, 页码 18713-18720出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.6b03177
关键词
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资金
- Science and Technology Development Project of Jilin province [20080329]
- National Natural Science Young Foundations of China [51302034]
- Doctoral/Postdoctoral Fundamental Research Funds of Xinjiang Normal University [XJNUBS1542]
- Scientific and Technological Innovation Reserve Talent Program of Xinjiang [wr2015cx03]
White lighting converted by tricolor phosphor and near-ultraviolet light-emitting diode demonstrates great potential in general lighting. However, a major.problem with this approach is the lower luminous efficiency of the resulting white lighting by the reabsorption among tricolor phosphors. In this work, we propose a general but effective method for achieving high-efficacy white light-emitting diodes (WLEDs) by using two-color phosphors having the same host that can lower energy loss by reabsorption. Color-tunable Sr7.95Si4O12Cl8:0.05Eu(2+) (SSO_Cl:0.05Eu(2+)) phosphors are synthesized by cationic substitution Strategy, and the emission colors can be tuned from blue-greenish to blue/yellow by Sr -> Mg/Ca Substitution. The red-shifted emission is attributed to the increased Eu2+ d-orbital splitting owing to the smaller size of Ca2+, whereas blue-shifted Eu2+ emission is unusual in Mg-substitution for Sr2+. WLEDs with luminous efficacies (eta(L)) of 28.9-56 lm/W and CRIs of 79-90.2 are demonstrated using the two-color phosphors. By employing a narrow-line Mn4+ emission deep red oxyfluoride phosphor, a high CRI (Ra = 90.3, R9 = 94) WLED with eta(L) of 39.3 lm/W is obtained. These findings provide a possible way for developing high CRI WLED by using two-color phosphors.
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