Photoluminescence features of new Eu3+ -doped Gd4Mo7O27 phosphors synthesized using glass crystallization technique

Mikiya Kotaka,Tsuyoshi Honma,Takayuki Komatsu

doi:10.1080/21870764.2018.1511231

Mikiya Kotaka, Tsuyoshi Honma + Show 1 more

Open Access

https://doi.org/10.1080/21870764.2018.1511231

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Abstract

ABSTRACTNew Eu3+-doped Gd4Mo7O27 crystals (the molar ratio of Gd2O3/MoO3 = 1/3.5) with a monoclinic structure C2/c (an inversion symmetry) were synthesized through the crystallization of xEu2O3-(18.89-x)Gd2O3-66.11MoO3-15B2O3-1Al2O3 glasses (x = 0.0472 and 1.889) and photoluminescence (PL) emissions of Eu3+ ions were measured for the first time. The crystallized glass with no Eu2O3 addition (x = 0) showed a blue color under the irradiation of ultra-violet light with a wavelength of λ = 254 nm, the emitting color of the crystallized glass with x = 0.0472 was pink, and that of the crystallized glass with x = 1.889 was orange. The charge transfer (CT) of O2-→Mo6+ providing broad peaks centered at around 325 nm was observed in the crystallized glasses. The peak intensity at 591 nm for the 5D0→7F1 transition of Eu3+ ions in the crystallized glasses with x = 0.0472 and 1.889 was very close to that at 615 nm for the 5D0→7F2 transition for the excitation of λex = 394.5 nm. We propose potential of Gd4Mo7O27 as a new host crystal for rare-earth-doped phosphors.

Highlights

Excellent photoluminescence (PL) performances of rareearth (RE) ions in glasses and crystals have been achieved through the design of the coordination and bonding states of RE ions
The present authors [3] succeeded in synthesizing new crystallized glasses consisting of Gd4Mo7O27 crystals using the composition designed Gd2O3-MoO3-B2O3 glasses with Gd2O3/ MoO3 = 1/3.5
Prior to the discussion of the PL features of the crystallized glasses consisting of Gd4Mo7O27 crystals observed in the previous section, the structural features of Gd4Mo7O27 crystal are described

Summary

Introduction

Excellent photoluminescence (PL) performances of rareearth (RE) ions in glasses and crystals have been achieved through the design of the coordination and bonding states of RE ions. The Gd4Mo7O27 crystalline phase has not been reported in the phase diagram for the binary. Naruke and Yamase [5] found a new crystalline phase of Gd4Mo7O27 with a monoclinic structure C2/c through the pyrolysis of [Gd2(H2O) 12Mo8O27].8H2O at 750°C for 2 h in air. They reported the synthesis of Eu4Mo7O27 crystals using a pyrolysis technique similar to the synthesis of

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