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Li, Yezhou,Wang, Yuhua The Korean Infomation Display Society 2011 Journal of information display Vol.12 No.2
Single-phased $CaZrO_3:Dy^{3+}$, $Tm^{3+}$ series have been successfully synthesized by solid-state reaction, and their luminescence properties were investigated. Under 355 nm excitation, $CaZrO_3:Dy^{3+}$ series showed characteristic emission of $Dy^{3+}$, which exhibited yellowish white color. By introducing $Tm^{3+}$ into the matrix, the emitted hue of the $Dy^{3+}$-doped sample could be easily tailored to white, and simultaneously, energy transfer from $Tm^{3+}$ to $Dy^{3+}$ was observed. The color coordinates of the optimum white-emitting sample were (0.321, 0.323), which were very close to the data of the National Television Standard Committee (0.33, 0.33). The co-activated phosphors presented good match to ultraviolet light-emitting diodes (LEDs), which revealed that they could be novel promising phosphors utilized in white LED application.
Yezhou Li,Yuhua Wang 한국정보디스플레이학회 2011 Journal of information display Vol.12 No.2
Single-phased CaZrO3:Dy3+, Tm3+ series have been successfully synthesized by solid-state reaction, and their luminescence properties were investigated. Under 355 nm excitation, CaZrO3: Dy3+ series showed characteristic emission of Dy3+, which exhibited yellowish white color. By introducing Tm3+ into the matrix, the emitted hue of the Dy3+-doped sample could be easily tailored to white, and simultaneously, energy transfer from Tm3+ to Dy3+ was observed. The color coordinates of the optimum white-emitting sample were (0.321, 0.323), which were very close to the data of the National Television Standard Committee (0.33, 0.33). The co-activated phosphors presented good match to ultraviolet light-emitting diodes (LEDs), which revealed that they could be novel promising phosphors utilized in white LED application.
A note on unicity of meromorphic functions in several variables
Yezhou Li,Heqing Sun 대한수학회 2023 대한수학회지 Vol.60 No.4
Let $f(z)$ be a meromorphic function in several variables satisfying $$\limsup\limits_{r\rightarrow\infty}\frac{\log T(r,f)}{r}=0.$$ We mainly investigate the uniqueness problem on $f$ in $\mathbb{C}^{m}$ sharing polynomial or periodic small function with its difference polynomials from a new perspective. Our main theorems can be seen as the improvement and extension of previous results.
Qibin Cheng,Yezhou Li,Zhixue Liu 대한수학회 2023 대한수학회보 Vol.60 No.2
This paper is concerned with the value distribution for meromorphic solutions $f$ of a class of nonlinear partial differential-difference equation of first order with small coefficients. We show that such solutions $f$ are uniquely determined by the poles of $f$ and the zeros of $f-c, f-d$ (counting multiplicities) for two distinct small functions $c, d$.