Kyung Hee University · Materials Science
Professor Yongbin Hua's research lab specializes in the design, synthesis, and characterization of rare-earth and transition metal ion-doped perovskite and double-perovskite phosphors for advanced optoelectronic applications. The lab focuses on developing phosphors with high photoluminescence quantum yields, excellent thermal stability, and tunable emission colors for use in white light-emitting diodes (WLEDs) and optical temperature sensing. Key research directions include exploring energy transfer mechanisms, crystal field effects, and charge transfer processes to optimize luminescent performance. The lab also investigates materials compatible with plant photosynthesis, such as deep-red emitting phosphors for agricultural lighting.
Figures are computed from collected data and may differ slightly.
In this work, novel green-emitting La2MgTiO6:Er3+ (LMTO:Er3+) phosphors were successfully synthesized. The phase structure, electronic structure, morphology, luminescence behaviors, and other optical characteristics were investigated in detail. Besides, the optical sensing properties of the thermal-coupled levels (2H11/2, 4S3/2) were investigated based on the fluorescence intensity ratio principle, and the maximum absolute and relative sensing sensitivities were found to be as high as 0.963% and
Novel rare-earth (RE; e.g., europium (Eu<sup>3+</sup>), samarium (Sm<sup>3+</sup>), and praseodymium (Pr<sup>3+</sup>)) and transition metal (TM<sup>4+</sup>; e.g., manganese (Mn<sup>4+</sup>)) ion single-/co-doped double-perovskite Ca<sub>2</sub>InTaO<sub>6</sub> (CITO) phosphors were prepared and investigated with respect to their crystal structure and photoluminescence (PL) properties. Among them, the CITO:Eu<sup>3+</sup> phosphors were found to exhibit an ultra-high internal PL quantum yield
At present, rare-earth-activated perovskite-type materials have attracted lots of interest from researchers owing to their excellent advantages of unique electron properties and stable structure. This present work was designed to synthesize, investigate, and compare the photoluminescence properties in europium(III) (Eu3+)-activated Ca2BB′O6 (B = Y, Gd, and La; B′ = Sb and Nb) double-perovskite (A2BB′O6) luminescent materials. The doped Eu3+ ions substitute the B sites of Y3+, Gd3+, and La3+ ions
Abstract Different luminescent behaviors of La 3 NbO 7 :Sm 3+ phosphors under the excitations of charge transfer band (CTB, 250 nm) and featured absorption peak ( 6 H 5/2 → 4 H 7/2 , 405 nm) of Sm 3+ ions were demonstrated. Under the excitation wavelength of 405 nm, the optimal La 3 NbO 7 :0.1Sm 3+ phosphor exhibited an orange‐red emission while the chromatic coordinate was found to be (0.609, 0.387), which also showed the excellent thermal performance, exhibiting its emission intensity of about
The Sm<sup>3+</sup> and Tb<sup>3+</sup> ion-doped NaLa(MoO<sub>4</sub>)<sub>2</sub> can be used for optical temperature sensors, safety signs, and warm WLEDs.
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