XVII-ICSMV

LUMINESCENCE PROPERTIES OF CORDIERITE RED-EMITTING PHOSPHOR PREPARED BY COMBUSTION SYNTHESIS FOR APPLICATIONS IN WHITE-LIGHT ILLUMINATION LEDS

Not scheduled

1h 30m

Museo Caracol (Ensenada, México)

Poster Luminescence Phenomena: Materials and Applications LUMINESCENCE PHENOMENA

Speaker

Mr Alexei Miridonov (Department of Optics. Center for Scientific Research and Higher Education at Ensenada, Baja California. Carretera Ensenada-Tijuana No.3918, Ensenada, B.C., C.P. 22860, México.)

Description

There is a need to develop composite phosphors for white-emitting lamps based on blue LEDs that can be efficiently activated and generate light with high color rendering index (CRI). In particular, there are only few red-emitting luminescent materials excited with blue photons for CRI improvement of the illumination devices. In this investigation, we report a two-stage energy-efficient methodology to fabricate Eu-doped α-cordierite red-emitting phosphors. The first stage of the process consists in the preparation of a spinel-phase (MgAl2O4) and SiO2 mixture by using low-temperature combustion synthesis. Post-annealing treatment at 1350°C for just 1 hour in a reducing atmosphere is employed as the second stage to obtain α-Mg2Al4Si5O18:Eu2+. When blue light (465 nm) was used as the excitation source the cordierite phosphor powders yielded a broad red emission peak centered around 617 nm making this material a robust red-emitting phosphor and a potential candidate for integration with YAG:Ce to improve CRI in white-emitting LED lamps. On the other hand, the photoluminescence spectrum of α-Mg2Al4Si5O18:Eu2+ displayed a broad blue emission band peaking at 465-488 nm under UV (365 nm) excitation.

This work was supported by

CONAHCYT PhD scholarship

Reference

no reference