A unique color converter geometry for laser-driven white lighting

作者：Xu, Jian; Hu, Baofu; Xu, Chao; Wang, Jian; Liu, Bingguo; Li, Hui; Wang, Xinliang; Du, Baoli^*; Gong, Yuxuan^*

来源：Optical Materials, 2018, 86: 286-290.

DOI：10.1016/j.optmat.2018.10.012

• Laser lighting
• Quantum dot
• Ceramic phosphor
• Color rendering
• Al2O3-YAG:Ce

The development of quantum dot (QD) layers as color converters in phosphor-converted white laser diodes (pc-wLDs) is restricted due to their low stability under laser irradiation. The present study aims to develop a unique color converter geometry that enables the QD layer for high-power pc-wLDs. A red emitting QD layer was coated on a thermally stable and heat-conducting Al2O3-YAG:Ce composite ceramic (CC), which played dual role of yellow emitter and heat sink. Thus, thermal and flux pressure on the QD layer has been significantly mitigated. Under irradiation of a 5 W blue laser, the operating temperature for the QD layer was as low as similar to 68 degrees C. Furthermore, the CC-QD color converter and a blue LD were combined to fabricate pc-wLDs, which have exhibited superior color properties in terms of a high color rendering index (similar to 80), a high wall-plug efficiency (similar to 91 lm/W). and tunable color temperatures. This indicates the suitability of QD layer for high-power and high color rendering laser lighting.

• 出版日期2018-12
• 单位河南理工大学