Eu3+-Doped Tellurite Phosphors

High-CRI White Light & Thermometry

Full substitution of anionic groups enhances red emission, enabling precise optical thermometry and high-color-rendering white LEDs.

Zhang, Hongzhi · Weigang, Wang · Youwen, Tang · Jianguo, Jia · Zibo, Huang · Xie, Zhi · Li, Junpeng · Zhu, Jing

Ceramics International 2026

Specifications

Color rendering index

{'zh': '93', 'en': '93'}

Maximum relative sensitivity

{'zh': '0.065', 'en': '0.065'} % K−1

Advantages

Efficiently excited by near-UV/blue LEDs

Characteristic red emission under 396 nm excitation matches the emission of InGaN-based LED chips.

High thermal stability

Substituting [MoO4] with [WO4] enhances the intensity, efficiency, and thermostability of the red luminescence.

High relative sensitivity for thermometry

At 473 K, the maximum relative sensitivities are 0.108% K−1 and 0.065% K−1 for the two phosphors, respectively.

High color rendering index

The white LED prototype using Ca3(TeO3)2WO4:Eu3+ as the red component achieves a high color rendering index of 93.

Applications

• White LEDs：Used as the red component to boost the color rendering index to 93 for high-quality white light.
• Optical Temperature Sensors：Exploits temperature-dependent emission intensity ratio for non-contact temperature sensing.
• Precision Thermometry：Relative sensitivity up to 0.108% K−1 at 473 K enables precise thermometry.
• Luminescent Materials：Eu3+-doped tellurite provides stable and efficient red emission for various applications.