Nowadays, red phosphor plays a key role in improving the lighting quality and color rendering index of phosphor‐converted white light emitting diodes (w‐LEDs). However, the development of thermally stable and highly efficient red phosphor is still a pivotal challenge. Herein, a new strategy to design antithermal‐quenching red emission in Eu , Mn ‐codoped phosphors is proposed. The photoluminescence intensity of Mg Y Ge O : Eu , Mn (0 ≤ ≤ 1) phosphors continuously enhances with rising temperature from 298 to 523 K based on Eu → Mn energy transfer. For Mg Eu Ge O :Mn sample, the integrated intensity at 523 K remarkably reaches 120% of that at 298 K. Interestingly, through codoping Eu and Mn in Mg Y Ge O , the photoluminescence color is controllably tuned from orangish‐red (610 nm) to deep‐red (660 nm) light by changing Eu concentration. The fabricated w‐LEDs exhibit superior warm white light with low corrected color temperature (CCT = 4848 K) and high color rendering index ( = 96.2), indicating the promising red component for w‐LED applications. Based on the abnormal increase in antistokes peaks of Mn with temperatures, Mg Eu Ge O :Mn phosphor also presents a potential application in optical thermometry sensors. This work initiates a new insight to construct thermally stable and spectra‐tunable red phosphors for various optical applications.
展开▼
机译：如今，红色荧光粉在改善荧光粉转换的白光发光二极管（w-LED）的照明质量和显色指数方面起着关键作用。然而，开发热稳定且高效的红色磷光体仍然是关键的挑战。本文提出了一种设计Eu，Mn共掺杂的荧光粉的抗热猝灭红光的新策略。镁Y的光致发光强度 Ge O：Eu，基于Eu→Mn的能量传递，随着温度从298 K升高到523 K，Mn（0≤≤1）荧光粉不断增强。对于Mg Eu Ge O：Mn样品，在523 K时的积分强度显着达到298 K时的120％。有趣的是，通过在Mg Y Ge O中共掺杂Eu和Mn，可从橙红色（610改变Eu浓度，将其转换为深红色（660 nm）光。制成的w-LED表现出出众的暖白光，具有较低的校正色温（CCT = 4848 K）和较高的显色指数（ = 96.2），表示用于w-LED应用的有希望的红色成分。基于Mn的反斯托克斯峰随温度的异常增加，Mg Eu Ge O：Mn荧光粉在光学测温传感器中也有潜在的应用。这项工作为构建适用于各种光学应用的热稳定和可光谱调谐的红色荧光粉提供了新的见解。
展开▼
