| Summary: | In this work, aiming to evaluate and compare the luminescent property of Eu ^3+ doped La(OH) _3 nanorods and its decomposed compounds of LaOOH and La _2 O _3 , La(OH) _3 : Eu ^3+ nanorods were synthesized and the decomposition behaviors in air and hydrogen were revealed. Then the luminescent property of 0%–8% Eu ^3+ doped La(OH) _3 nanorods and the 300 °C–800 °C calcined La(OH) _3 : Eu ^3+ - 4% were studied. Results show that LaOOH is intermediate product during the degradation of La(OH) _3 in air or H _2 , which can be formed at a temperature range in 372.3 °C–592.9 °C in air. Intensity of emission spectra of La(OH) _3 : Eu ^3+ nanorods increases with the rising of Eu ^3+ dopant concentration, and the emission property of Eu ^3+ doped LaOOH and La _2 O _3 is varied and strengthened with that of La(OH) _3 : Eu ^3+ . Luminescent matrixes of LaOOH and La _2 O _3 show similar emission spectrum and intensity, and the transitions of the D _0 → ^7 F _1 and D _0 → ^7 F _2 of Eu ^3+ each bifurcate into two peaks for both europium (III) doped La _2 O _3 and LaOOH. The revealed results suggest that LaOOH is a relative thermal-stable compound and should be an appropriate matrix as similar as La _2 O _3 for luminescent applications.
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