Kumar Pawan, Singh Devender, Gupta Isha
Department of Chemistry, Maharshi Dayanand University Rohtak 124001 Haryana India
RSC Adv. 2023 Mar 8;13(11):7703-7718. doi: 10.1039/d3ra00636k. eCollection 2023 Mar 1.
A material's luminosity characteristics, which in turn dictate its applicability, are critically influenced by its structure. Therefore, it is essential for design and fabrication of optical nanocrystalline materials to comprehend the relationship between structural and luminescence properties. The gel-combustion approach was used to produce a sequence of orange-red light emanating GdSrAlO:Sm (GSA:Sm) nanophosphors which are used for warm white-light-emitting diodes (w-LEDs). Comprehensive investigation of the structural and optical characteristics of GdSrAlO:Sm nanophosphors has been done in a detailed manner. The synthesized powdered nanophosphors are crystallized in a tetragonal phase with 4/ (140) space group, affirmed through Rietveld refining method. The nano size with an aggregated, spherical form of the particles in the powdered nanocrystalline material was revealed by TEM analysis. These orange-red emitting phosphors Gd SrAlO:Sm ( = 1-7 mol%) were shown to possess photoluminosity (PL) properties that demonstrated the presence of most intense emission peaks at 603 nm that were caused by G → H transitions of the Sm ion under 273 nm excitation. Considering its long decay lifespan and PL emission, it can be concluded that the GdSrAlO:Sm phosphor is a potential single element for the fabrication of warm white light-emitting devices.
材料的发光特性反过来决定了其适用性，而这又受到其结构的严重影响。因此，理解结构与发光特性之间的关系对于光学纳米晶体材料的设计和制造至关重要。采用凝胶燃烧法制备了一系列用于暖白色发光二极管（w-LED）的发出橙红色光的GdSrAlO:Sm（GSA:Sm）纳米磷光体。已对GdSrAlO:Sm纳米磷光体的结构和光学特性进行了详细的综合研究。通过Rietveld精修法确定，合成的纳米磷光体粉末结晶为具有I4/mmm（140）空间群的四方相。通过透射电子显微镜（TEM）分析揭示了粉末状纳米晶体材料中颗粒呈聚集球形的纳米尺寸。这些发射橙红色光的磷光体GdSrAlO:Sm（x = 1-7 mol%）显示出光致发光（PL）特性，即在273 nm激发下，Sm离子的G→H跃迁导致在603 nm处出现最强发射峰。考虑到其长衰减寿命和PL发射，可以得出结论，GdSrAlO:Sm磷光体是制造暖白色发光器件的潜在单一元素。
