Data for: "Colloidal Semiconductor Quantum Well Supraparticles as Low-Threshold and Photostable Microlasers"

This study introduces and compares the lasing performance of micron-sized and sphere-shaped supraparticle (SP) microlasers fabricated through bottom-up assembly of II-VI semiconductor colloidal quantum wells (CQWs) with their counterparts made of colloidal quantum dots (CQDs). The CQWs consist of a 4-monolayers thick CdSe core and an 8-monolayers thick CdxZn1-xS shell with a nominal size of 14 × 15 × 4.2 nm, and the CQDs are CdSxSe1-x/ZnS with 6 nm diameter. Both SPs are optically characterized with a 0.76 ns pulse laser (spot size: 2.88 × 10 - 7 cm2) at 532 nm, and emit in the 620 – 670nm spectral range. Results show that CQW SPs have lasing thresholds 3 × lower (0.1 nJ) than the CQD SPs (0.3 nJ), and stress tests using a constant 0.6 nJ optical pump energy demonstrate that CQW SPs withstand lasing emission for longer than CQD SPs. Lasing emission in CQW and CQD SPs under continuous operation yields half-lives of τ_(CQW SP)≈150 min and τ_(CQD SP)≈20 min, respectively. The half-life of CQW SPs is further extended to τ_QW≈10^3 min when optically pumped at 0.2 nJ. Such results compare favourably to those in the literature and highlight the performance of CdSe-based CQW SPs for laser applications.