Dual-Mode Luminescence with Broad Near UV and Blue Excitation Band from Sr2CaMoO6:Sm3+ Phosphor for White LEDs

作者：Wang Lili; Noh Hyeon Mi; Moon Byung Kee; Park Sung Heum; Kim Kwang Ho; Shi Jinsheng; Jeong Jung Hyun^*

来源：Journal of Physical Chemistry C, 2015, 119(27): 15517-15525.

DOI：10.1021/acs.jpcc.5b02828

Dual-mode excitation properties were introduced in Sm3+ doped Sr2CaMoO6 prepared by a high temperature solid state reaction technique. Two ways are available to generate white light in the single-component phosphor activated by Sm3+ ions. Warm white light can be obtained from Sr1.995Sm0.085CaMoO6 phosphor pumped by 380 or 411 nm excitation energy. The full visible spectral emission of the single-phase phosphor comes from the high and low level emission lines of Sm3+ ions as well as the intrinsic luminescence of MoO6 group. It is also competitive as yellow-emitting phosphor for blue pumped white LEDs and gives three emission bands at 567, 603, and 650 nm, presenting yellow luminescence upon 466 nm radiation. The 650 nm red emission band corresponding to (4)G(5/2) -> H-6(9/2) transition of Sm3+ can make its color rendering index better. The excellent photoluminescence of Sr2CaMoO6 is related to the partial tilting CaO6 octahedral and the lowered symmetry were confirmed by General Structure Analysis System. Band gap of Sr2CaMoO6 estimated from the diffuse reflection spectra and also calculated by CASTEP mode shows its semiconducting character. All the results show that the Sr2-xSmxCaMoO6 phosphors have considerable potential for applications in near UV LED or pumped by blue LED chip.

• 出版日期2015-7-9
• 单位青岛农业大学