A novel red-emitting phosphor Mg2Y2Al2Si2O12:Ce3+/Mn2+ for blue chip-based white LEDs. Issue 5 (13th January 2021)

• Record Type: Journal Article
• Authors: Wang, Zhipeng; Wang, Zhijun; Li, Yuebin; Liu, Jinjin; Bao, Qi; Meng, Xiangyu; Qiu, Keliang; Yang, Zhiping; Wang, Dawei; Li, Panlai
• Is Part Of: RSC advances. Volume 11:Issue 5(2021)
• Page Start: 2706
• Page End: 2717
• Publication Date: 2021-01-13
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra09289d
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The change of the emission spectra of Mg1.93 Y2- x Al2 Si2 O12 :0.07Ce 3+, x Mn 2+ originates from the change of the structure and the energy transfer between ions. Abstract : Traditional white light-emitting diodes (LEDs) (blue chip + YAG:Ce 3+ yellow phosphor) have the limitation of red deficiency, which limits their application in the illumination field. The single cation/anion substitution or co-doping of activators can increase the red component; however, the large energy loss is attributed to the ultra-long Stokes shift and energy transfer. This work attempts to utilize the short-distance Stokes shift and a small amount of energy transfer to increase the red component in two steps. First, based on a large number of previous research results, the Mg2 Y2 Al2 Si2 O12 :Ce 3+ phosphor is selected. Second, additional enhancement of the red component in the emission spectrum was achieved by ion co-doping Mn 2+ into Mg2 Y2 Al2 Si2 O12 :Ce 3+ . The emission peaks for samples Mg2 Y2 Al2 Si2 O12 :Ce 3+, Mn 2+ shift from 600 to 635 nm with increase in the concentration of Mn 2+, and the emission spectra intensity of Mg1.97 Y1.93 Al2 Si2 O12 :0.07 Ce 3+, 0.03 Mn 2+ anomalously increased by ∼37%, which was attributed to the increase in the distance between Ce 3+ ions because of the doping of Mn 2+ ions, and reduction in the concentration of defects in the crystal, resulting in the energy loss decreases of Ce 3+ . The emission peak of Mg1.97 Y1.93 Al2 Si2 O12 :0.07 Ce 3+, 0.03 Mn 2+ shifts to 618 nm and the quantum efficiency was as high as 83.07%. Furthermore, this sample has high thermal stability and the emission intensity was still 80.14% at 120 °C. As such, it has great potential in the application of white LEDs.