Rapid synthesis of hybrid methylammonium lead iodide perovskite quantum dots and rich MnI2 substitution favouring Pb-free warm white LED applications

Rajan Kumar Singh, Sudipta Som, Somrita Dutta, Neha Jain, Mei Tsun Kuo, Jai Singh, Ranveer Kumar*, Teng-Ming Chen

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

We present a facile room temperature synthesis of CH3NH3Pb1-xMnxI3 perovskite quantum dots (PQDs) substituting manganese (Mn2+) at the lead (Pb2+) sites to minimize environmental pollution and make it commercially feasible. By varying the concentration of Mn2+ from 0 to 60%, the PQDs exhibit strong color tunability from red to orange color suggesting successful energy transfer due to Mn2+ inclusion. We observed a high external photoluminescence quantum yield (PLQY) of 98% for unsubstituted CH3NH3PbI3 and >50% for up to 15% Mn2+ substituted PQDs. The average lifetime of PQDs was found to shorten with increasing Mn2+ replacement. We demonstrate a white LED prototype by employing the CH3NH3Pb1-xMnxI3 PQDs with green QDs on a blue LED chip. The CRI and CCT value varying from 92 to 80 and 5100 K to 2900 K, respectively, indicate the usability of the Mn2+ substituted PQDs as efficient warm white LEDs with a promising CRI and good stability.

Original languageEnglish
Pages (from-to)2999-3008
Number of pages10
JournalNanoscale Advances
Volume1
Issue number8
DOIs
StatePublished - 1 Jan 2019

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