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Optical Properties of Red-Emitting Rb2Bi(PO4)(MoO4):Eu3+ Powders and Ceramics with High Quantum Efficiency for White LEDs.

ABSTRACT: There are several key requirements that a very good LED phosphor should meet, i.e., strong absorption, high quantum efficiency, high colour purity, and high luminescence quenching temperature. The reported Rb2Bi(PO4)(MoO4):Eu3+ phosphors have all these properties. The Rb2Bi(PO4)(MoO4):Eu3+ phosphors emit bright red light if excited with near-UV radiation. The calculated colour coordinates show good stability in the 77-500 K temperature range. Moreover, sample doped with 50% Eu3+ possesses quantum efficiency close to unity. Besides the powder samples, ceramic disks of Rb2Eu(PO4)(MoO4) specimen were also prepared, and the red light sources from these disks in combination with near-UV emitting LED were fabricated. The obtained results indicated that ceramic disks efficiently absorb the emission of 375 and 400 nm LED and could be applied as a red component in phosphor-converted white LEDs.

SUBMITTER: Grigorjevaite J 

PROVIDER: S-EPMC6804156 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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Optical Properties of Red-Emitting Rb<sub>2</sub>Bi(PO<sub>4</sub>)(MoO<sub>4</sub>):Eu<sup>3+</sup> Powders and Ceramics with High Quantum Efficiency for White LEDs.

Grigorjevaite Julija J   Ezerskyte Egle E   Minderyte Agne A   Stanionyte Sandra S   Juskenas Remigijus R   Sakirzanovas Simas S   Katelnikovas Arturas A  

Materials (Basel, Switzerland) 20191008 19

There are several key requirements that a very good LED phosphor should meet, i.e., strong absorption, high quantum efficiency, high colour purity, and high luminescence quenching temperature. The reported Rb<sub>2</sub>Bi(PO<sub>4</sub>)(MoO<sub>4</sub>):Eu<sup>3+</sup> phosphors have all these properties. The Rb<sub>2</sub>Bi(PO<sub>4</sub>)(MoO<sub>4</sub>):Eu<sup>3+</sup> phosphors emit bright red light if excited with near-UV radiation. The calculated colour coordinates show good stability  ...[more]

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