Gd3Al5O12:Ce 石榴石的位点选择性和协同掺杂用于结构稳定和低 CCT 和高 CRI 的暖 WLED 照明,Dalton Transactions

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Gd3Al5O12:Ce 石榴石的位点选择性和协同掺杂用于结构稳定和低 CCT 和高 CRI 的暖 WLED 照明
Dalton Transactions ( IF 3.5 ) Pub Date : 2021-12-01 , DOI: 10.1039/d1dt03599a
Qinghong Meng ₁ , Guoying Zhao _{2,

3} , Qi Zhu ₁ , Xiaodong Li ₁ , Xudong Sun _{1,

4} , Ji-Guang Li ₃

Affiliation

亚稳态 Gd ₃ Al ₅ O ₁₂ :Ce 石榴石与 Ca ²⁺ /Hf ⁴⁺对和 Sc ^{3+ 的}协同掺杂形成 Gd _{2.97− x} Ca _x Hf _x Sc _y Al ₃ O ₁₂ :0.03Ce ( x = 0.5–2.0, y = 0.0–1.5, x + y = 2.0) 固溶体进行结构稳定和光致发光操作。Ca ²⁺ /Hf ⁴⁺ /Sc ³⁺的选址通过XRD、Rietveld精修、TEM和UV-Vis/光致发光光谱的结果，详细揭示了掺杂剂以及掺杂对晶体结构、局部配位、能带结构和Ce ³⁺发光的影响。观察到 Ca ²⁺ /Hf ^{4+ 的}减少和 Sc ³⁺含量的增加会缩小晶格，扩大石榴石主体的带隙，使激发/发射波长红移，加宽发射带并缩短Ce ^{3+ 的}荧光寿命。通过考虑Ce ³⁺ 5d 能级的局部配位和晶体场分裂使光谱变化合理化。典型 Gd _0.97 Ca 的应用₂ Hf₂ Al₃ O₁₂ :0.03Ce ( x = 2.0, y = 0) 青色和 Gd_2.47 Ca_0.5 Hf_0.5 Sc_1.5 Al₃ O₁₂ :0.03Ce ( x = 0.5, y = 1.5) 黄绿色w-WLED 照明在 395 nm n-UV 和 450 nm 蓝光激发下产生 ~3842 和 3514 K 的低相关色温、~88 和 93 的高显色指数以及 ~32.9 和 14.7 lm/W 的良好发光效率LED芯片，分别。

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Site-selective and cooperative doping of Gd3Al5O12:Ce garnets for structural stabilization and warm WLED lighting of low CCT and high CRI

Synergistic doping of the metastable Gd₃Al₅O₁₂:Ce garnet with a Ca²⁺/Hf⁴⁺ pair and Sc³⁺ to form Gd_2.97−xCa_xHf_xSc_yAl₃O₁₂:0.03Ce (x = 0.5–2.0, y = 0.0–1.5, x + y = 2.0) solid solution was conducted for the structural stabilization and photoluminescence manipulation. The site selection of Ca²⁺/Hf⁴⁺/Sc³⁺ dopants and the effects of doping on the crystal structure, local coordination, band structure and Ce³⁺ luminescence were revealed in detail with the results of XRD, Rietveld refinement, TEM, and UV-Vis/photoluminescence spectroscopy. A decrease in Ca²⁺/Hf⁴⁺ and an increase in the Sc³⁺ content were observed to shrink the lattice, widen the bandgap of the garnet host, red-shift the excitation/emission wavelength, broaden the emission band and shorten the fluorescence lifetime of Ce³⁺. The spectral changes were rationalized by considering the local coordination and crystal field splitting of the Ce³⁺ 5d energy level. Application of typical Gd_0.97Ca₂Hf₂Al₃O₁₂:0.03Ce (x = 2.0, y = 0) cyan and Gd_2.47Ca_0.5Hf_0.5Sc_1.5Al₃O₁₂:0.03Ce (x = 0.5, y = 1.5) greenish-yellow phosphors in w-WLED lighting produced low correlated color temperatures of ∼3842 and 3514 K, high color rendering indices of ∼88 and 93 and favorable luminous efficacies of ∼32.9 and 14.7 lm/W under the excitation of 395 nm n-UV and 450 nm blue LED chips, respectively.

更新日期：2021-12-15

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