Synthesis of BaSi ₂ O ₂ N ₂ :Ce ³⁺ ,Eu ²⁺ Phosphors and Determination of their Luminescence Properties

Abstract

BaSi 2 O 2 N 2 :Ce 3+ ,Eu 2+ phosphors were successfully synthesized via the solid‐state reaction method. Their luminescence properties were experimentally investigated and qualify them for further consideration as components in white light‐emitting diodes. In particular, BaSi 2 O 2 N 2 :Eu 2+ phosphors have an efficient bluish–green emission band that peaks at 490 nm. Ce 3+ ‐doped BaSi 2 O 2 N 2 showed a bright emission band at 390 nm. A red shift tuning capability of emission bands was achieved by increasing the Eu 2+ or Ce 3+ contents. Measurements of the intensity of emission spectra suggested a concentration quenching effect for both Eu 2+ and Ce 3+ . Analysis of the experimental results suggests that the enhancement of emission intensity in the produced codoped BaSi 2 O 2 N 2 :Ce 3+ ,Eu 2+ phosphors is due to resonance‐type energy transfer from Ce 3+ to Eu 2+ ions, which is predominantly governed by dipole–dipole interaction mechanism. The efficiency of energy transfer was calculated and the critical distance of energy transfer between Ce 3+ and Eu 2+ was determined as ∼25 Å.