Bi-functional　thin　film　with　both　selected　light　extraction　and　reliable　moisture　vapor　barrier　was　proposed　for　simultaneous　light　management　and　encapsulation　in　the　fields　of　lighting　and　display.　Atomic　layer　deposition　(ALD)　was　employed　to　obtain　TiO2　and　Al2O3　films　with　high　uniformity,　forming　distributed　Bragg　reflector　(DBR)　structure.　The　DBRs　exhibited　excellent　and　tunable　optical　properties,　as　well　as　reliable　moisture　barrier　performance.　With　increasing　the　DBR　layers,　the　transmittances　decreased　obviously.　The　transmittance　in　the　blue　light　region　was　as　low　as　0.66%　for　DBR　with　6.5　pairs　and　the　water　vapor　transmission　rates　value　was　3.06　x　10(-5)　g　m(-2)　d(-1)　for　DBR　with　4.5　pairs.　These　DBRs　were　integrated　in　the　red　quantum　dot　(QD)　based　color　converters　excited　by　blue　LED,　enabling　an　obvious　increase　in　red　emission　and　a　strong　decrease　in　blue　light　transmittance.　Furthermore,　these　DBRs　can　prolong　the　lifetime　of　QDs　evidently　by　isolating　the　QDs　from　the　moisture　(oxygen)　vapor.　These　results　highlight　the　potentials　for　the　exploitation　of　DBRs　fabricated　using　ALD　in　the　application　of　lighting　and　display　devices　based　on　QD　photoluminescence　and　electroluminescence.