Preparation and luminescence properties of orange-red Ba₃Y₄O₉:Sm³⁺ phosphors

Jiayu Li^1,2，Ran Pang¹，Zhan Yu²，Liyan Liu²，Haiyan Wu^1,3，Huimin Li^1,3，Lihong Jiang¹，Su Zhang¹，Jing Feng¹，Chengyu Li¹

1. State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences2. School of Chemistry and Chemical Engineering,Shenyang Normal University3. University of Chinese Academy of Sciences

摘 要：A novel orange-red emitting Ba₃ Y₄ O₉:Sm³⁺ phosphors were prepared by a high temperature solidstate reaction in air. X-ray diffraction（XRD）, photoluminescence spectra, fluorescence decay and temperature-dependent emission spectra were utilized to characterize the structure and luminescence properties. The results show that the excitation spectrum includes a series of linear peaks at350, 367, 382, 410, 424, 445, 470 and 495 nm, respectively. Under 410 nm excitation, the emission peaks were located at 574 nm(⁴ G_5/2-⁶ H_5/2), 608 nm(⁴ G_5/2-⁶ H_7/2),659 nm(⁴ G_5/2-⁶ H_9/2) and722 nm(⁴ G_5/2-⁶ H_11/2), respectively. The concentration quenching occurs when x equals 0.08 for Ba₃ Y_4-xO₉:xSm³⁺ phosphor and its mechanism is ascribed to the dipole-dipole interaction. The chromaticity coordinates of Ba₃ Y_3.92O₉:0.08 Sm³⁺ phosphor are in the orange-red region. The temperature-dependent study shows that this phosphor has excellent luminescence thermal-stability.And the luminescence intensity of Ba₃ Y_3.92O₉:0.08 Sm³⁺ phosphor at 473 K only declines by about25.75% of its initial intensity. The experimental data indicate that Ba₃ Y₄ O₉:Sm³⁺ phosphor may be promising as an orange-red emitting phosphor for white light emitting diodes.

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