Luminescent properties of Sr2MgSi2O7:Eu2+ as blue phosphor for NUV light-emitting diodes

✍ Scribed by Xinguo Zhang; Xueping Tang; Jilin Zhang; Huihui Wang; Jianxin Shi; Menglian Gong

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 663 KB
• Volume: 204
• Category: Article
• ISSN: 0032-5910
• DOI: 10.1016/j.powtec.2010.08.011

✦ Synopsis

Akermanite phosphor Sr 2 MgSi 2 O 7 :Eu 2+ was synthesized by solid-state reaction under a H 2 -N 2 atmosphere, and its photo-physical behaviors were systematically characterized by photoluminescence excitation and emission spectra, concentration quenching, and thermal quenching process. This phosphor is efficiently excited in the wavelength range of 300-420 nm, which matches to a near UV-emitting InGaN chip, and emits strong and wide band blue light peaking at 470 nm. The relationship between emission peak wavelength and Eu 2+ occupied sites was illuminated through Van Uitert's equation. The concentration quenching mechanism was verified to be a dipole-dipole interaction and the critical energy-transfer distance was confirmed as around 13 Å through both calculated crystal structure method and experimental spectral method. The activation energy for thermal quenching was calculated to be 0.4044 eV. Phosphor-converted LED was fabricated with Sr 2 MgSi 2 O 7 :0.06Eu 2+ and 395 nm-emitting InGaN chip and exhibited strong wide band blue emission. These results indicate that Sr 2 MgSi 2 O 7 :Eu 2+ is a promising candidate as a blue component for near UV-based multi-phosphor-converted white LEDs.