Structure characterization and photoluminescence properties of (Y0.95−xGdxEu0.05)2O3 red phosphors converted from layered rare-earth hydroxide (LRH) nanoflake precursors

► LRH nanoflakes were obtained for Y/Gd/Eu ternary system. ► nanoplate and nanoparticle forms of (Y0.95−xGdxEu0.05)2O3 red phosphors were derived from LRHs. ► Gd3+-Eu3+ energy transfer was observed. ► optical properties have been correlated to particle morphology and structural features.