Blue–green color-tunable emissions in novel transparent Sr<sub>2</sub>LuF<sub>7</sub>:Eu/Tb glass-ceramics for WLEDs

Xiaoman Li; Shaoshuai Zhou; Rongfei Wei; Xueyun Liu; Bingqiang Cao; Hai Guo

doi:10.3788/COL202018.051601

Chinese Optics Letters, Volume. 18, Issue 5, 051601(2020)

Blue–green color-tunable emissions in novel transparent Sr₂LuF₇:Eu/Tb glass-ceramics for WLEDs

Xiaoman Li^1,2、*, Shaoshuai Zhou¹, Rongfei Wei³, Xueyun Liu⁴, Bingqiang Cao^1、**, and Hai Guo³

¹School of Physics and Physical Engineering, Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Qufu Normal University, Qufu 273165, China

²State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China

³Department of Physics, Zhejiang Normal University, Jinhua 321004, China

⁴Laboratory of Infrared Materials and Devices, Advanced Technology Research Institute, Ningbo University, Ningbo 315211, China

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Fig. 1. (a) XRD patterns of PGEuTb, GCEu, GCTb, and GCEuTb and the standard data for ${Sr}_{2} {LuF}_{7}$ (JCPDS No. 39-0926); (b) transmission spectra of PGEu, GCEu, PGTb, PGEuTb, and GCEuTb; (c) TEM and (d) HRTEM images of nano-structured GCEu. The inset is corresponding SAED patterns.

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Fig. 2. (a) Excitation ( $λ_{em} = 613 nm$ ) and (b) emission ( $λ_{ex} = 393 nm$ ) spectra of PGEu and GCEu.

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Fig. 3. (a) Emission spectra of PGEu and GCEu excited by 350 nm; normalized (b) emission and (c) excitation spectra of ${Eu}^{2 +}$ ions in the GCEu sample.

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Fig. 4. (a) Excitation ( $λ_{em} = 543 nm$ ) and (b) emission ( $λ_{ex} = 377 nm$ ) spectra of ${Tb}^{3 +}$ -doped samples (PGTb and GCTb).

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Fig. 5. (a) Emission spectra ( $λ_{ex} = 350 nm$ ) and (b) decay lifetime of ${Eu}^{2 +}$ ions ( $λ_{ex} = 350 nm$ , $λ_{em} = 427 nm$ ) of GCEu and GCEuTb samples.

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Fig. 6. CIE of GCEu (excited by 280, 300, 350, and 393 nm) and GCTb (excited by 377 nm).

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Fig. 7. Emission spectra excited by 350 nm of (a) PGEu and (b) GCEu under different temperatures from 300 to 500 K.

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Table 1. Compositions of Glasses Samples (in mol%)
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Table 1. Compositions of Glasses Samples (in mol%)
Samples Host Eu Tb
PGEu/GCEu ${SiO}_{2} - {Al}_{2} O_{3} - {SrF}_{2} - {LuF}_{3}$ $0 . {5 EuF}_{3}$ 0
PGEuTb/GCEuTb ${SiO}_{2} - {Al}_{2} O_{3} - {SrF}_{2} - {LuF}_{3}$ $0.5 {EuF}_{3}$ $0.5 {TbF}_{3}$
PGTb/GCTb ${SiO}_{2} - {Al}_{2} O_{3} - {SrF}_{2} - {LuF}_{3}$ 0 $0.5 {TbF}_{3}$

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Xiaoman Li, Shaoshuai Zhou, Rongfei Wei, Xueyun Liu, Bingqiang Cao, Hai Guo. Blue–green color-tunable emissions in novel transparent Sr₂LuF₇:Eu/Tb glass-ceramics for WLEDs[J]. Chinese Optics Letters, 2020, 18(5): 051601

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