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Designed synthesis, morphology evolution and enhanced photoluminescence of a highly efficient red dodec-fluoride phosphor, Li3Na3Ga2F12:Mn4+, for warm WLEDs†
Journal of Materials Chemistry C ( IF 6.4 ) Pub Date : 2017-12-07 00:00:00 , DOI: 10.1039/c7tc04878e
Mengmeng Zhu 1, 2, 3, 4, 5 , Yuexiao Pan 1, 2, 3, 4, 5 , Yaqi Huang 1, 2, 3, 4, 5 , Hongzhou Lian 5, 6, 7, 8, 9 , Jun Lin 5, 6, 7, 8, 9
Affiliation  

Red phosphors of the Mn4+ doped dodec-fluoride Li3Na3Ga2F12:Mn4+ (LNGF:Mn) with various morphologies have been synthesized from K2MnF6, LiF, NaF and Ga2O3 in HF at room temperature with excess LiF and NaF relative to the stoichiometric composition of LNGF:Mn. The formation mechanism of the red phosphor LNGF:Mn has been discussed based on detailed experimental results compared with that of the identified phosphor Li3Na3Al2F12:Mn4+ (LNAF:Mn). The optical properties of LNGF:Mn have been systematically investigated and compared with those of red phosphors Li3GaF6:Mn4+ (LGF:Mn), Na3GaF6:Mn4+ (NGF:Mn) and LNAF:Mn in detail. It is observed that the as-obtained phosphor LNGF:Mn exhibits superior properties in chromaticity coordinates as well as a high luminescence efficiency with a strong potential to enhance the performance of solid-state lighting. The HF-concentration-dependent morphologies of the phosphor LNGF:Mn have been investigated by scanning electron microscopy (SEM). The luminescence of the phosphor LNGF:Mn has been enhanced by optimizing the synthetic parameters, such as the concentrations of HF and K2MnF6. The white light-emitting diode (WLED) encapsulated with the as-obtained red phosphor LNGF:Mn and a commercial yellow one, Y3Al5O12:Ce3+ (YAG:Ce), on a GaN chip produces a warm white light with a color rendering index (CRI) of 91.32 at a correlated color temperature (CCT) of 3986.08 K.

中文翻译:

用于温暖的WLED的 高效红色十二氟化物荧光粉Li 3 Na 3 Ga 2 F 12:Mn 4+的设计合成,形态演变和增强的光致发光

由HF中的K 2 MnF 6,LiF,NaF和Ga 2 O 3合成了具有各种形态的Mn 4+掺杂十二氟化物Li 3 Na 3 Ga 2 F 12:Mn 4+(LNGF:Mn)的红色荧光粉。在室温下,相对于LNGF:Mn的化学计量组成,LiF和NaF过量。根据详细的实验结果,与确定的荧光粉Li 3 Na 3 Al 2 F 12:Mn 4+进行了比较,讨论了红色荧光粉LNGF:Mn的形成机理。(LNAF:Mn)。已经系统地研究了LNGF:Mn的光学性质,并将其与红色荧光粉Li 3 GaF 6:Mn 4+(LGF:Mn),Na 3 GaF 6:Mn 4+(NGF:Mn)和LNAF:Mn的光学性质进行了比较。细节。观察到,所获得的磷光体LNGF:Mn在色度坐标上显示出优异的性能,并且具有高发光效率,并且具有增强固态照明性能的强大潜力。通过扫描电子显微镜(SEM)研究了磷光体LNGF:Mn的HF浓度依赖性形貌。通过优化合成参数,例如HF和K的浓度,可以增强LNGF:Mn荧光粉的发光2 MnF 6。用获得的红色荧光粉LNGF:Mn和商用黄色荧光粉Y 3 Al 5 O 12:Ce 3+(YAG:Ce)封装的白色发光二极管(WLED)在GaN芯片上产生温暖的白色在相关色温(CCT)为3986.08 K时具有91.32的显色指数(CRI)的光源。
更新日期:2017-12-07
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